137421939 has 4 divisors (see below), whose sum is σ = 183229256. Its totient is φ = 91614624.

The previous prime is 137421887. The next prime is 137421967. The reversal of 137421939 is 939124731.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 137421939 - 2¹³ = 137413747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 137421897 and 137421906.

It is not an unprimeable number, because it can be changed into a prime (137421539) 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, 22903654 + ... + 22903659.

It is an arithmetic number, because the mean of its divisors is an integer number (45807314).

Almost surely, 2^137421939 is an apocalyptic number.

137421939 is a deficient number, since it is larger than the sum of its proper divisors (45807317).

137421939 is an equidigital number, since it uses as much as digits as its factorization.

137421939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45807316.

The product of its digits is 40824, while the sum is 39.

The square root of 137421939 is about 11722.7103947850. The cubic root of 137421939 is about 516.0423655198.

The spelling of 137421939 in words is "one hundred thirty-seven million, four hundred twenty-one thousand, nine hundred thirty-nine".