253978 has 4 divisors (see below), whose sum is σ = 380970. Its totient is φ = 126988.

The previous prime is 253969. The next prime is 253987. The reversal of 253978 is 879352.

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

It is an interprime number because it is at equal distance from previous prime (253969) and next prime (253987).

It can be written as a sum of positive squares in only one way, i.e., 173889 + 80089 = 417^2 + 283^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63493 + ... + 63496.

2²⁵³⁹⁷⁸ is an apocalyptic number.

253978 is a deficient number, since it is larger than the sum of its proper divisors (126992).

253978 is a wasteful number, since it uses less digits than its factorization.

253978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126991.

The product of its digits is 15120, while the sum is 34.

The square root of 253978 is about 503.9623001773. The cubic root of 253978 is about 63.3284268283.

The spelling of 253978 in words is "two hundred fifty-three thousand, nine hundred seventy-eight".