253439878 has 4 divisors (see below), whose sum is σ = 380159820. Its totient is φ = 126719938.

The previous prime is 253439873. The next prime is 253439887. The reversal of 253439878 is 878934352.

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

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253439873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63359968 + ... + 63359971.

It is an arithmetic number, because the mean of its divisors is an integer number (95039955).

Almost surely, 2^253439878 is an apocalyptic number.

253439878 is a deficient number, since it is larger than the sum of its proper divisors (126719942).

253439878 is a wasteful number, since it uses less digits than its factorization.

253439878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126719941.

The product of its digits is 1451520, while the sum is 49.

The square root of 253439878 is about 15919.7951619988. The cubic root of 253439878 is about 632.8366899330.

The spelling of 253439878 in words is "two hundred fifty-three million, four hundred thirty-nine thousand, eight hundred seventy-eight".