137905973 has 4 divisors (see below), whose sum is σ = 138136800. Its totient is φ = 137675148.

The previous prime is 137905961. The next prime is 137906051. The reversal of 137905973 is 379509731.

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, and also an emirpimes, since its reverse is a distinct semiprime: 379509731 = 61 ⋅6221471.

It is a cyclic number.

It is not a de Polignac number, because 137905973 - 2¹² = 137901877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137905903) 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, 114515 + ... + 115712.

It is an arithmetic number, because the mean of its divisors is an integer number (34534200).

Almost surely, 2^137905973 is an apocalyptic number.

It is an amenable number.

137905973 is a deficient number, since it is larger than the sum of its proper divisors (230827).

137905973 is an equidigital number, since it uses as much as digits as its factorization.

137905973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230826.

The product of its (nonzero) digits is 178605, while the sum is 44.

The square root of 137905973 is about 11743.3373876424. The cubic root of 137905973 is about 516.6475317691.

The spelling of 137905973 in words is "one hundred thirty-seven million, nine hundred five thousand, nine hundred seventy-three".