402669438 has 16 divisors (see below), whose sum is σ = 806890896. Its totient is φ = 133964480.

The previous prime is 402669431. The next prime is 402669457. The reversal of 402669438 is 834966204.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 402669438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402669431) 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, 61281 + ... + 67532.

It is an arithmetic number, because the mean of its divisors is an integer number (50430681).

Almost surely, 2^402669438 is an apocalyptic number.

402669438 is an abundant number, since it is smaller than the sum of its proper divisors (404221458).

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

402669438 is a wasteful number, since it uses less digits than its factorization.

402669438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129339.

The product of its (nonzero) digits is 248832, while the sum is 42.

The square root of 402669438 is about 20066.6249778083. The cubic root of 402669438 is about 738.4417160161.

The spelling of 402669438 in words is "four hundred two million, six hundred sixty-nine thousand, four hundred thirty-eight".