253439947 has 2 divisors, whose sum is σ = 253439948. Its totient is φ = 253439946.

The previous prime is 253439941. The next prime is 253439957. The reversal of 253439947 is 749934352.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253439947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 253439897 and 253439906.

It is not a weakly prime, because it can be changed into another prime (253439941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126719973 + 126719974.

It is an arithmetic number, because the mean of its divisors is an integer number (126719974).

Almost surely, 2^253439947 is an apocalyptic number.

253439947 is a deficient number, since it is larger than the sum of its proper divisors (1).

253439947 is an equidigital number, since it uses as much as digits as its factorization.

253439947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 46.

The square root of 253439947 is about 15919.7973291120. The cubic root of 253439947 is about 632.8367473637.

The spelling of 253439947 in words is "two hundred fifty-three million, four hundred thirty-nine thousand, nine hundred forty-seven".