137907881 has 4 divisors (see below), whose sum is σ = 138395472. Its totient is φ = 137420292.

The previous prime is 137907857. The next prime is 137907901. The reversal of 137907881 is 188709731.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 137907881 - 2⁶ = 137907817 is a prime.

It is a super-2 number, since 2×137907881² = 38037167283820322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137907811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243371 + ... + 243936.

It is an arithmetic number, because the mean of its divisors is an integer number (34598868).

Almost surely, 2^137907881 is an apocalyptic number.

It is an amenable number.

137907881 is a deficient number, since it is larger than the sum of its proper divisors (487591).

137907881 is an equidigital number, since it uses as much as digits as its factorization.

137907881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487590.

The product of its (nonzero) digits is 84672, while the sum is 44.

The square root of 137907881 is about 11743.4186249150. The cubic root of 137907881 is about 516.6499144528.

The spelling of 137907881 in words is "one hundred thirty-seven million, nine hundred seven thousand, eight hundred eighty-one".