521120040 has 128 divisors (see below), whose sum is σ = 1891848960. Its totient is φ = 112103424.

The previous prime is 521120029. The next prime is 521120069. The reversal of 521120040 is 40021125.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3967 + ... + 32526.

It is an arithmetic number, because the mean of its divisors is an integer number (14780070).

Almost surely, 2^521120040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521120040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (945924480).

521120040 is an abundant number, since it is smaller than the sum of its proper divisors (1370728920).

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

521120040 is a wasteful number, since it uses less digits than its factorization.

521120040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36531 (or 36527 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 521120040 is about 22828.0537935234. The cubic root of 521120040 is about 804.7220932864.

Adding to 521120040 its reverse (40021125), we get a palindrome (561141165).

The spelling of 521120040 in words is "five hundred twenty-one million, one hundred twenty thousand, forty".