402551320 has 64 divisors (see below), whose sum is σ = 943164000. Its totient is φ = 154441728.

The previous prime is 402551311. The next prime is 402551333. The reversal of 402551320 is 23155204.

It is a junction number, because it is equal to n+sod(n) for n = 402551291 and 402551300.

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, 188016 + ... + 190144.

Almost surely, 2^402551320 is an apocalyptic number.

402551320 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 402551320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (471582000).

402551320 is an abundant number, since it is smaller than the sum of its proper divisors (540612680).

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

402551320 is a wasteful number, since it uses less digits than its factorization.

402551320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2332 (or 2328 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 402551320 is about 20063.6816162937. The cubic root of 402551320 is about 738.3695047675.

The spelling of 402551320 in words is "four hundred two million, five hundred fifty-one thousand, three hundred twenty".