399861402 has 8 divisors (see below), whose sum is σ = 799722816. Its totient is φ = 133287132.

The previous prime is 399861401. The next prime is 399861409. The reversal of 399861402 is 204168993.

It is a sphenic number, since it is the product of 3 distinct primes.

399861402 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (399861401) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 33321778 + ... + 33321789.

It is an arithmetic number, because the mean of its divisors is an integer number (99965352).

Almost surely, 2^399861402 is an apocalyptic number.

399861402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

399861402 is a wasteful number, since it uses less digits than its factorization.

399861402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66643572.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 399861402 is about 19996.5347498010. The cubic root of 399861402 is about 736.7211899977.

The spelling of 399861402 in words is "three hundred ninety-nine million, eight hundred sixty-one thousand, four hundred two".