402129394 has 16 divisors (see below), whose sum is σ = 634611096. Its totient is φ = 190857600.

The previous prime is 402129389. The next prime is 402129397. The reversal of 402129394 is 493921204.

It can be written as a sum of positive squares in 4 ways, for example, as 369216225 + 32913169 = 19215^2 + 5737^2 .

It is not an unprimeable number, because it can be changed into a prime (402129397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63237 + ... + 69304.

Almost surely, 2^402129394 is an apocalyptic number.

402129394 is a deficient number, since it is larger than the sum of its proper divisors (232481702).

402129394 is a wasteful number, since it uses less digits than its factorization.

402129394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132621.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 402129394 is about 20053.1641892246. The cubic root of 402129394 is about 738.1114455806. Note that the first 3 decimals are identical.

The spelling of 402129394 in words is "four hundred two million, one hundred twenty-nine thousand, three hundred ninety-four".