137902690 has 16 divisors (see below), whose sum is σ = 248566392. Its totient is φ = 55085184.

The previous prime is 137902651. The next prime is 137902711. The reversal of 137902690 is 96209731.

It can be written as a sum of positive squares in 4 ways, for example, as 100460529 + 37442161 = 10023^2 + 6119^2 .

It is a super-2 number, since 2×137902690² = 38034303818472200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1539 + ... + 16678.

Almost surely, 2^137902690 is an apocalyptic number.

137902690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

137902690 is a deficient number, since it is larger than the sum of its proper divisors (110663702).

137902690 is a wasteful number, since it uses less digits than its factorization.

137902690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18981.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 137902690 is about 11743.1976054225. The cubic root of 137902690 is about 516.6434319532.

The spelling of 137902690 in words is "one hundred thirty-seven million, nine hundred two thousand, six hundred ninety".