137643939 has 12 divisors (see below), whose sum is σ = 199081896. Its totient is φ = 91641312.

The previous prime is 137643931. The next prime is 137643953. The reversal of 137643939 is 939346731.

It is a happy number.

It is not a de Polignac number, because 137643939 - 2³ = 137643931 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 137643894 and 137643903.

It is not an unprimeable number, because it can be changed into a prime (137643931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2634 + ... + 16799.

It is an arithmetic number, because the mean of its divisors is an integer number (16590158).

Almost surely, 2^137643939 is an apocalyptic number.

137643939 is a deficient number, since it is larger than the sum of its proper divisors (61437957).

137643939 is a wasteful number, since it uses less digits than its factorization.

137643939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20226 (or 20223 counting only the distinct ones).

The product of its digits is 367416, while the sum is 45.

The square root of 137643939 is about 11732.1753737318. The cubic root of 137643939 is about 516.3200983947.

The spelling of 137643939 in words is "one hundred thirty-seven million, six hundred forty-three thousand, nine hundred thirty-nine".