129422440 has 64 divisors (see below), whose sum is σ = 333797760. Its totient is φ = 44240640.

The previous prime is 129422437. The next prime is 129422441. The reversal of 129422440 is 44224921.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 129422399 and 129422408.

It is not an unprimeable number, because it can be changed into a prime (129422441) 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, 157230 + ... + 158050.

It is an arithmetic number, because the mean of its divisors is an integer number (5215590).

Almost surely, 2^129422440 is an apocalyptic number.

129422440 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 129422440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166898880).

129422440 is an abundant number, since it is smaller than the sum of its proper divisors (204375320).

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

129422440 is a wasteful number, since it uses less digits than its factorization.

129422440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1402 (or 1398 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 129422440 is about 11376.3983755844. The cubic root of 129422440 is about 505.8283825922.

The spelling of 129422440 in words is "one hundred twenty-nine million, four hundred twenty-two thousand, four hundred forty".