402399994 has 32 divisors (see below), whose sum is σ = 635475456. Its totient is φ = 190903680.

The previous prime is 402399989. The next prime is 402399997. The reversal of 402399994 is 499993204.

It is not an unprimeable number, because it can be changed into a prime (402399997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1013404 + ... + 1013800.

It is an arithmetic number, because the mean of its divisors is an integer number (19858608).

Almost surely, 2^402399994 is an apocalyptic number.

402399994 is a deficient number, since it is larger than the sum of its proper divisors (233075462).

402399994 is a wasteful number, since it uses less digits than its factorization.

402399994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750.

The product of its (nonzero) digits is 629856, while the sum is 49.

The square root of 402399994 is about 20059.9101194397. The cubic root of 402399994 is about 738.2769712179.

The spelling of 402399994 in words is "four hundred two million, three hundred ninety-nine thousand, nine hundred ninety-four".