402090137 has 8 divisors (see below), whose sum is σ = 437249736. Its totient is φ = 368209152.

The previous prime is 402090113. The next prime is 402090151. The reversal of 402090137 is 731090204.

It can be written as a sum of positive squares in 4 ways, for example, as 296493961 + 105596176 = 17219^2 + 10276^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 402090137 - 2²² = 397895833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402090167) 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, 318998 + ... + 320255.

It is an arithmetic number, because the mean of its divisors is an integer number (54656217).

Almost surely, 2^402090137 is an apocalyptic number.

It is an amenable number.

402090137 is a deficient number, since it is larger than the sum of its proper divisors (35159599).

402090137 is a wasteful number, since it uses less digits than its factorization.

402090137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639307.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 402090137 is about 20052.1853422514. The cubic root of 402090137 is about 738.0874259621.

The spelling of 402090137 in words is "four hundred two million, ninety thousand, one hundred thirty-seven".