129812840 has 16 divisors (see below), whose sum is σ = 292078980. Its totient is φ = 51925120.

The previous prime is 129812831. The next prime is 129812849. The reversal of 129812840 is 48218921.

It is an interprime number because it is at equal distance from previous prime (129812831) and next prime (129812849).

It can be written as a sum of positive squares in 2 ways, for example, as 114618436 + 15194404 = 10706^2 + 3898^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 129812840.

It is not an unprimeable number, because it can be changed into a prime (129812849) 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, 1622621 + ... + 1622700.

Almost surely, 2^129812840 is an apocalyptic number.

129812840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129812840 is an abundant number, since it is smaller than the sum of its proper divisors (162266140).

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

129812840 is a wasteful number, since it uses less digits than its factorization.

129812840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3245332 (or 3245328 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 129812840 is about 11393.5437858464. The cubic root of 129812840 is about 506.3364788506.

The spelling of 129812840 in words is "one hundred twenty-nine million, eight hundred twelve thousand, eight hundred forty".