137972621973 has 8 divisors (see below), whose sum is σ = 191961908928. Its totient is φ = 87982541504.

The previous prime is 137972621953. The next prime is 137972621989. The reversal of 137972621973 is 379126279731.

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 137972621973 - 2²² = 137968427669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137972621953) 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, 999801540 + ... + 999801677.

It is an arithmetic number, because the mean of its divisors is an integer number (23995238616).

Almost surely, 2^137972621973 is an apocalyptic number.

It is an amenable number.

137972621973 is a deficient number, since it is larger than the sum of its proper divisors (53989286955).

137972621973 is a wasteful number, since it uses less digits than its factorization.

137972621973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999603243.

The product of its digits is 6001128, while the sum is 57.

The spelling of 137972621973 in words is "one hundred thirty-seven billion, nine hundred seventy-two million, six hundred twenty-one thousand, nine hundred seventy-three".