137925921 has 16 divisors (see below), whose sum is σ = 221235200. Its totient is φ = 74666448.

The previous prime is 137925911. The next prime is 137925929. The reversal of 137925921 is 129529731.

It is not a de Polignac number, because 137925921 - 2⁶ = 137925857 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 137925921.

It is not an unprimeable number, because it can be changed into a prime (137925929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172441 + ... + 173238.

It is an arithmetic number, because the mean of its divisors is an integer number (13827200).

Almost surely, 2^137925921 is an apocalyptic number.

It is an amenable number.

137925921 is a deficient number, since it is larger than the sum of its proper divisors (83309279).

137925921 is a wasteful number, since it uses less digits than its factorization.

137925921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345708.

The product of its digits is 34020, while the sum is 39.

The square root of 137925921 is about 11744.1866895924. The cubic root of 137925921 is about 516.6724414663.

The spelling of 137925921 in words is "one hundred thirty-seven million, nine hundred twenty-five thousand, nine hundred twenty-one".