402342520 has 64 divisors (see below), whose sum is σ = 943099200. Its totient is φ = 154291200.

The previous prime is 402342509. The next prime is 402342533. The reversal of 402342520 is 25243204.

It is a junction number, because it is equal to n+sod(n) for n = 402342491 and 402342500.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174012 + ... + 176308.

It is an arithmetic number, because the mean of its divisors is an integer number (14735925).

Almost surely, 2^402342520 is an apocalyptic number.

402342520 is a gapful number since it is divisible by the number (40) 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 402342520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (471549600).

402342520 is an abundant number, since it is smaller than the sum of its proper divisors (540756680).

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

402342520 is a wasteful number, since it uses less digits than its factorization.

402342520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2488 (or 2484 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 402342520 is about 20058.4775095220. The cubic root of 402342520 is about 738.2418206616.

Adding to 402342520 its reverse (25243204), we get a palindrome (427585724).

The spelling of 402342520 in words is "four hundred two million, three hundred forty-two thousand, five hundred twenty".