129316420 has 12 divisors (see below), whose sum is σ = 271564524. Its totient is φ = 51726560.

The previous prime is 129316387. The next prime is 129316427. The reversal of 129316420 is 24613921.

It can be written as a sum of positive squares in 2 ways, for example, as 64288324 + 65028096 = 8018^2 + 8064^2 .

It is not an unprimeable number, because it can be changed into a prime (129316427) 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, 3232891 + ... + 3232930.

It is an arithmetic number, because the mean of its divisors is an integer number (22630377).

Almost surely, 2^129316420 is an apocalyptic number.

129316420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129316420 is an abundant number, since it is smaller than the sum of its proper divisors (142248104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129316420 is a wasteful number, since it uses less digits than its factorization.

129316420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6465830 (or 6465828 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 129316420 is about 11371.7377739728. The cubic root of 129316420 is about 505.6902237191.

The spelling of 129316420 in words is "one hundred twenty-nine million, three hundred sixteen thousand, four hundred twenty".