129880837 has 4 divisors (see below), whose sum is σ = 131141920. Its totient is φ = 128619756.

The previous prime is 129880831. The next prime is 129880843. The reversal of 129880837 is 738088921.

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: 738088921 = 487 ⋅1515583.

It is an interprime number because it is at equal distance from previous prime (129880831) and next prime (129880843).

It is a cyclic number.

It is not a de Polignac number, because 129880837 - 2²³ = 121492229 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 (129880831) 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, 630387 + ... + 630592.

It is an arithmetic number, because the mean of its divisors is an integer number (32785480).

Almost surely, 2^129880837 is an apocalyptic number.

It is an amenable number.

129880837 is a deficient number, since it is larger than the sum of its proper divisors (1261083).

129880837 is a wasteful number, since it uses less digits than its factorization.

129880837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261082.

The product of its (nonzero) digits is 193536, while the sum is 46.

The square root of 129880837 is about 11396.5274096981. The cubic root of 129880837 is about 506.4248711130.

The spelling of 129880837 in words is "one hundred twenty-nine million, eight hundred eighty thousand, eight hundred thirty-seven".