402109138172 has 24 divisors (see below), whose sum is σ = 851525234784. Its totient is φ = 162195282432.

The previous prime is 402109138157. The next prime is 402109138187. The reversal of 402109138172 is 271831901204.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (402109138157) and next prime (402109138187).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 422383073 + ... + 422384024.

It is an arithmetic number, because the mean of its divisors is an integer number (35480218116).

Almost surely, 2^402109138172 is an apocalyptic number.

It is an amenable number.

402109138172 is an abundant number, since it is smaller than the sum of its proper divisors (449416096612).

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

402109138172 is a wasteful number, since it uses less digits than its factorization.

402109138172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844767125 (or 844767123 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The spelling of 402109138172 in words is "four hundred two billion, one hundred nine million, one hundred thirty-eight thousand, one hundred seventy-two".