1255539138 has 32 divisors (see below), whose sum is σ = 2872267776. Its totient is φ = 358417488.

The previous prime is 1255539041. The next prime is 1255539139. The reversal of 1255539138 is 8319355521.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 1255539138.

It is not an unprimeable number, because it can be changed into a prime (1255539139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39145 + ... + 63587.

It is an arithmetic number, because the mean of its divisors is an integer number (89758368).

Almost surely, 2^1255539138 is an apocalyptic number.

1255539138 is an abundant number, since it is smaller than the sum of its proper divisors (1616728638).

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

1255539138 is a wasteful number, since it uses less digits than its factorization.

1255539138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25678.

The product of its digits is 162000, while the sum is 42.

The square root of 1255539138 is about 35433.5877099681. The cubic root of 1255539138 is about 1078.8061619495.

The spelling of 1255539138 in words is "one billion, two hundred fifty-five million, five hundred thirty-nine thousand, one hundred thirty-eight".