253683978 has 8 divisors (see below), whose sum is σ = 507367968. Its totient is φ = 84561324.

The previous prime is 253683977. The next prime is 253684001. The reversal of 253683978 is 879386352.

It is a sphenic number, since it is the product of 3 distinct primes.

253683978 is an admirable number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 253683978.

It is not an unprimeable number, because it can be changed into a prime (253683977) 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, 21140326 + ... + 21140337.

It is an arithmetic number, because the mean of its divisors is an integer number (63420996).

Almost surely, 2^253683978 is an apocalyptic number.

253683978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

253683978 is a wasteful number, since it uses less digits than its factorization.

253683978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42280668.

The product of its digits is 2177280, while the sum is 51.

The square root of 253683978 is about 15927.4598728109. The cubic root of 253683978 is about 633.0397964443.

The spelling of 253683978 in words is "two hundred fifty-three million, six hundred eighty-three thousand, nine hundred seventy-eight".