331520040 has 112 divisors (see below), whose sum is σ = 1118466900. Its totient is φ = 88397568.

The previous prime is 331520039. The next prime is 331520041. The reversal of 331520040 is 40025133.

It is an interprime number because it is at equal distance from previous prime (331520039) and next prime (331520041).

It can be written as a sum of positive squares in 2 ways, for example, as 331167204 + 352836 = 18198^2 + 594^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 331519995 and 331520022.

It is not an unprimeable number, because it can be changed into a prime (331520041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 23476 + ... + 34844.

Almost surely, 2^331520040 is an apocalyptic number.

331520040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 331520040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (559233450).

331520040 is an abundant number, since it is smaller than the sum of its proper divisors (786946860).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

331520040 is a wasteful number, since it uses less digits than its factorization.

331520040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11398 (or 11379 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 331520040 is about 18207.6917812226. The cubic root of 331520040 is about 692.1017202647.

Adding to 331520040 its reverse (40025133), we get a palindrome (371545173).

The spelling of 331520040 in words is "three hundred thirty-one million, five hundred twenty thousand, forty".