253638797 has 4 divisors (see below), whose sum is σ = 254746620. Its totient is φ = 252530976.

The previous prime is 253638757. The next prime is 253638823. The reversal of 253638797 is 797836352.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 187525636 + 66113161 = 13694^2 + 8131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253638797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253638757) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553568 + ... + 554025.

It is an arithmetic number, because the mean of its divisors is an integer number (63686655).

Almost surely, 2^253638797 is an apocalyptic number.

It is an amenable number.

253638797 is a deficient number, since it is larger than the sum of its proper divisors (1107823).

253638797 is a wasteful number, since it uses less digits than its factorization.

253638797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107822.

The product of its digits is 1905120, while the sum is 50.

The square root of 253638797 is about 15926.0414730089. The cubic root of 253638797 is about 633.0022128473.

The spelling of 253638797 in words is "two hundred fifty-three million, six hundred thirty-eight thousand, seven hundred ninety-seven".