255440139 has 8 divisors (see below), whose sum is σ = 355395072. Its totient is φ = 162889320.

The previous prime is 255440131. The next prime is 255440173. The reversal of 255440139 is 931044552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 255440139 - 2³ = 255440131 is a prime.

It is a super-2 number, since 2×255440139² = 130499329224678642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (255440131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1850947 + ... + 1851084.

It is an arithmetic number, because the mean of its divisors is an integer number (44424384).

Almost surely, 2^255440139 is an apocalyptic number.

255440139 is a deficient number, since it is larger than the sum of its proper divisors (99954933).

255440139 is a wasteful number, since it uses less digits than its factorization.

255440139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3702057.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 255440139 is about 15982.4947677138. The cubic root of 255440139 is about 634.4972058937.

The spelling of 255440139 in words is "two hundred fifty-five million, four hundred forty thousand, one hundred thirty-nine".