253990642 has 32 divisors (see below), whose sum is σ = 420001200. Its totient is φ = 114659328.

The previous prime is 253990621. The next prime is 253990673. The reversal of 253990642 is 246099352.

It can be written as a sum of positive squares in 8 ways, for example, as 187388721 + 66601921 = 13689^2 + 8161^2 .

It is a super-2 number, since 2×253990642² = 129022492447144328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 253990595 and 253990604.

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, 169834 + ... + 171322.

Almost surely, 2^253990642 is an apocalyptic number.

253990642 is a deficient number, since it is larger than the sum of its proper divisors (166010558).

253990642 is a wasteful number, since it uses less digits than its factorization.

253990642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1710.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 253990642 is about 15937.0838612338. The cubic root of 253990642 is about 633.2947755535.

The spelling of 253990642 in words is "two hundred fifty-three million, nine hundred ninety thousand, six hundred forty-two".