129393937 has 4 divisors (see below), whose sum is σ = 129541360. Its totient is φ = 129246516.

The previous prime is 129393841. The next prime is 129393949. The reversal of 129393937 is 739393921.

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: 739393921 = 7 ⋅105627703.

It is a cyclic number.

It is not a de Polignac number, because 129393937 - 2²³ = 121005329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129393967) 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, 72387 + ... + 74152.

It is an arithmetic number, because the mean of its divisors is an integer number (32385340).

Almost surely, 2^129393937 is an apocalyptic number.

It is an amenable number.

129393937 is a deficient number, since it is larger than the sum of its proper divisors (147423).

129393937 is an equidigital number, since it uses as much as digits as its factorization.

129393937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147422.

The product of its digits is 275562, while the sum is 46.

The square root of 129393937 is about 11375.1455814860. The cubic root of 129393937 is about 505.7912466186.

The spelling of 129393937 in words is "one hundred twenty-nine million, three hundred ninety-three thousand, nine hundred thirty-seven".