129394440 has 96 divisors (see below), whose sum is σ = 480617280. Its totient is φ = 29575296.

The previous prime is 129394423. The next prime is 129394451. The reversal of 129394440 is 44493921.

129394440 is a `hidden beast` number, since 129 + 3 + 94 + 440 = 666.

It is a super-2 number, since 2×129394440² = 33485842205827200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 129394395 and 129394404.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23154 + ... + 28193.

It is an arithmetic number, because the mean of its divisors is an integer number (5006430).

Almost surely, 2^129394440 is an apocalyptic number.

129394440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129394440 is an abundant number, since it is smaller than the sum of its proper divisors (351222840).

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

129394440 is a wasteful number, since it uses less digits than its factorization.

129394440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51371 (or 51364 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 129394440 is about 11375.1676910716. The cubic root of 129394440 is about 505.7919020143.

The spelling of 129394440 in words is "one hundred twenty-nine million, three hundred ninety-four thousand, four hundred forty".