129204840 has 32 divisors (see below), whose sum is σ = 387614880. Its totient is φ = 34454592.

The previous prime is 129204827. The next prime is 129204853. The reversal of 129204840 is 48402921.

It is an interprime number because it is at equal distance from previous prime (129204827) and next prime (129204853).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 129204798 and 129204807.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 538234 + ... + 538473.

It is an arithmetic number, because the mean of its divisors is an integer number (12112965).

Almost surely, 2^129204840 is an apocalyptic number.

129204840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129204840 is an abundant number, since it is smaller than the sum of its proper divisors (258410040).

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

129204840 is a wasteful number, since it uses less digits than its factorization.

129204840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076721 (or 1076717 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 129204840 is about 11366.8306928537. The cubic root of 129204840 is about 505.5447378079.

The spelling of 129204840 in words is "one hundred twenty-nine million, two hundred four thousand, eight hundred forty".