129949440 has 144 divisors (see below), whose sum is σ = 425217408. Its totient is φ = 33804288.

The previous prime is 129949429. The next prime is 129949441. The reversal of 129949440 is 44949921.

It is a junction number, because it is equal to n+sod(n) for n = 129949392 and 129949401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129949441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 164727 + ... + 165513.

Almost surely, 2^129949440 is an apocalyptic number.

129949440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129949440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (212608704).

129949440 is an abundant number, since it is smaller than the sum of its proper divisors (295267968).

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

129949440 is an equidigital number, since it uses as much as digits as its factorization.

129949440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854 (or 840 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 129949440 is about 11399.5368326963. The cubic root of 129949440 is about 506.5140198821.

The spelling of 129949440 in words is "one hundred twenty-nine million, nine hundred forty-nine thousand, four hundred forty".