402399380 has 12 divisors (see below), whose sum is σ = 845038740. Its totient is φ = 160959744.

The previous prime is 402399343. The next prime is 402399391. The reversal of 402399380 is 83993204.

It can be written as a sum of positive squares in 2 ways, for example, as 51811204 + 350588176 = 7198^2 + 18724^2 .

It is a super-2 number, since 2×402399380² = 323850522048768800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10059965 + ... + 10060004.

It is an arithmetic number, because the mean of its divisors is an integer number (70419895).

Almost surely, 2^402399380 is an apocalyptic number.

It is an amenable number.

402399380 is an abundant number, since it is smaller than the sum of its proper divisors (442639360).

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

402399380 is a wasteful number, since it uses less digits than its factorization.

402399380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20119978 (or 20119976 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 402399380 is about 20059.8948152776. The cubic root of 402399380 is about 738.2765957190.

The spelling of 402399380 in words is "four hundred two million, three hundred ninety-nine thousand, three hundred eighty".