253643247 has 48 divisors (see below), whose sum is σ = 455783328. Its totient is φ = 133539840.

The previous prime is 253643239. The next prime is 253643267. The reversal of 253643247 is 742346352.

253643247 is a `hidden beast` number, since 2 + 5 + 3 + 643 + 2 + 4 + 7 = 666.

It is not a de Polignac number, because 253643247 - 2³ = 253643239 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253643207) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16083 + ... + 27675.

It is an arithmetic number, because the mean of its divisors is an integer number (9495486).

Almost surely, 2^253643247 is an apocalyptic number.

253643247 is a deficient number, since it is larger than the sum of its proper divisors (202140081).

253643247 is a wasteful number, since it uses less digits than its factorization.

253643247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11640 (or 11637 counting only the distinct ones).

The product of its digits is 120960, while the sum is 36.

The square root of 253643247 is about 15926.1811806848. The cubic root of 253643247 is about 633.0059147565.

Adding to 253643247 its reverse (742346352), we get a palindrome (995989599).

The spelling of 253643247 in words is "two hundred fifty-three million, six hundred forty-three thousand, two hundred forty-seven".