129424640 has 36 divisors (see below), whose sum is σ = 310015524. Its totient is φ = 51769344.

The previous prime is 129424613. The next prime is 129424643. The reversal of 129424640 is 46424921.

It can be written as a sum of positive squares in 2 ways, for example, as 17572864 + 111851776 = 4192^2 + 10576^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 129424597 and 129424606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129424643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49277 + ... + 51836.

Almost surely, 2^129424640 is an apocalyptic number.

129424640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129424640 is an abundant number, since it is smaller than the sum of its proper divisors (180590884).

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

129424640 is an equidigital number, since it uses as much as digits as its factorization.

129424640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101134 (or 101120 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 129424640 is about 11376.4950665836. The cubic root of 129424640 is about 505.8312487003.

The spelling of 129424640 in words is "one hundred twenty-nine million, four hundred twenty-four thousand, six hundred forty".