137908644 has 24 divisors (see below), whose sum is σ = 335778240. Its totient is φ = 43970784.

The previous prime is 137908637. The next prime is 137908649. The reversal of 137908644 is 446809731.

It is a junction number, because it is equal to n+sod(n) for n = 137908596 and 137908605.

It is not an unprimeable number, because it can be changed into a prime (137908649) 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, 249559 + ... + 250110.

It is an arithmetic number, because the mean of its divisors is an integer number (13990760).

Almost surely, 2^137908644 is an apocalyptic number.

It is an amenable number.

137908644 is an abundant number, since it is smaller than the sum of its proper divisors (197869596).

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

137908644 is a wasteful number, since it uses less digits than its factorization.

137908644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499699 (or 499697 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 137908644 is about 11743.4511111513. The cubic root of 137908644 is about 516.6508672704.

The spelling of 137908644 in words is "one hundred thirty-seven million, nine hundred eight thousand, six hundred forty-four".