129742440 has 64 divisors (see below), whose sum is σ = 401794560. Its totient is φ = 33480960.

The previous prime is 129742439. The next prime is 129742441. The reversal of 129742440 is 44247921.

It is an interprime number because it is at equal distance from previous prime (129742439) and next prime (129742441).

It is not an unprimeable number, because it can be changed into a prime (129742441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13719 + ... + 21158.

It is an arithmetic number, because the mean of its divisors is an integer number (6278040).

Almost surely, 2^129742440 is an apocalyptic number.

129742440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129742440 is an abundant number, since it is smaller than the sum of its proper divisors (272052120).

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

129742440 is a wasteful number, since it uses less digits than its factorization.

129742440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34922 (or 34918 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 129742440 is about 11390.4538978919. The cubic root of 129742440 is about 506.2449302952.

The spelling of 129742440 in words is "one hundred twenty-nine million, seven hundred forty-two thousand, four hundred forty".