129321240 has 32 divisors (see below), whose sum is σ = 387964080. Its totient is φ = 34485632.

The previous prime is 129321229. The next prime is 129321251. The reversal of 129321240 is 42123921.

It is an interprime number because it is at equal distance from previous prime (129321229) and next prime (129321251).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 129321240.

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 7 ways as a sum of consecutive naturals, for example, 538719 + ... + 538958.

Almost surely, 2^129321240 is an apocalyptic number.

129321240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129321240 is an abundant number, since it is smaller than the sum of its proper divisors (258642840).

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

129321240 is a wasteful number, since it uses less digits than its factorization.

129321240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077691 (or 1077687 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 129321240 is about 11371.9497009088. The cubic root of 129321240 is about 505.6965064907.

The spelling of 129321240 in words is "one hundred twenty-nine million, three hundred twenty-one thousand, two hundred forty".