129109400 has 48 divisors (see below), whose sum is σ = 343065840. Its totient is φ = 44265600.

The previous prime is 129109361. The next prime is 129109417. The reversal of 129109400 is 4901921.

It is a self number, because there is not a number n which added to its sum of digits gives 129109400.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 44711 + ... + 47510.

It is an arithmetic number, because the mean of its divisors is an integer number (7147205).

Almost surely, 2^129109400 is an apocalyptic number.

129109400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129109400 is an abundant number, since it is smaller than the sum of its proper divisors (213956440).

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

129109400 is a wasteful number, since it uses less digits than its factorization.

129109400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92244 (or 92235 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 129109400 is about 11362.6317374101. The cubic root of 129109400 is about 505.4202298953.

The spelling of 129109400 in words is "one hundred twenty-nine million, one hundred nine thousand, four hundred".