1255642635 has 32 divisors (see below), whose sum is σ = 2165486400. Its totient is φ = 617614848.

The previous prime is 1255642601. The next prime is 1255642673. The reversal of 1255642635 is 5362465521.

It is not a de Polignac number, because 1255642635 - 2²³ = 1247254027 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a junction number, because it is equal to n+sod(n) for n = 1255642593 and 1255642602.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 299977 + ... + 304133.

It is an arithmetic number, because the mean of its divisors is an integer number (67671450).

Almost surely, 2^1255642635 is an apocalyptic number.

1255642635 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1255642635 is a deficient number, since it is larger than the sum of its proper divisors (909843765).

1255642635 is a wasteful number, since it uses less digits than its factorization.

1255642635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5727.

The product of its digits is 216000, while the sum is 39.

The square root of 1255642635 is about 35435.0481162366. The cubic root of 1255642635 is about 1078.8358039655.

The spelling of 1255642635 in words is "one billion, two hundred fifty-five million, six hundred forty-two thousand, six hundred thirty-five".