129306440 has 16 divisors (see below), whose sum is σ = 290939580. Its totient is φ = 51722560.

The previous prime is 129306439. The next prime is 129306451. The reversal of 129306440 is 44603921.

It can be written as a sum of positive squares in 2 ways, for example, as 122722084 + 6584356 = 11078^2 + 2566^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1616291 + ... + 1616370.

Almost surely, 2^129306440 is an apocalyptic number.

129306440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129306440 is an abundant number, since it is smaller than the sum of its proper divisors (161633140).

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

129306440 is a wasteful number, since it uses less digits than its factorization.

129306440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3232672 (or 3232668 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 129306440 is about 11371.2989583424. The cubic root of 129306440 is about 505.6772144965.

The spelling of 129306440 in words is "one hundred twenty-nine million, three hundred six thousand, four hundred forty".