129939877 has 2 divisors, whose sum is σ = 129939878. Its totient is φ = 129939876.

The previous prime is 129939863. The next prime is 129939907. The reversal of 129939877 is 778939921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120692196 + 9247681 = 10986^2 + 3041^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129939877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129939847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64969938 + 64969939.

It is an arithmetic number, because the mean of its divisors is an integer number (64969939).

Almost surely, 2^129939877 is an apocalyptic number.

It is an amenable number.

129939877 is a deficient number, since it is larger than the sum of its proper divisors (1).

129939877 is an equidigital number, since it uses as much as digits as its factorization.

129939877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1714608, while the sum is 55.

The square root of 129939877 is about 11399.1173781131. The cubic root of 129939877 is about 506.5015947615.

It can be divided in two parts, 129939 and 877, that added together give a triangular number (130816 = T₅₁₁).

The spelling of 129939877 in words is "one hundred twenty-nine million, nine hundred thirty-nine thousand, eight hundred seventy-seven".