129440255 has 16 divisors (see below), whose sum is σ = 186862080. Its totient is φ = 84087072.

The previous prime is 129440237. The next prime is 129440263. The reversal of 129440255 is 552044921.

It is a cyclic number.

It is not a de Polignac number, because 129440255 - 2¹² = 129436159 is a prime.

It is a super-2 number, since 2×129440255² = 33509559228930050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96659 + ... + 97988.

It is an arithmetic number, because the mean of its divisors is an integer number (11678880).

Almost surely, 2^129440255 is an apocalyptic number.

129440255 is a deficient number, since it is larger than the sum of its proper divisors (57421825).

129440255 is a wasteful number, since it uses less digits than its factorization.

129440255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194678.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 129440255 is about 11377.1813293100. The cubic root of 129440255 is about 505.8515906211.

The spelling of 129440255 in words is "one hundred twenty-nine million, four hundred forty thousand, two hundred fifty-five".