253491978 has 8 divisors (see below), whose sum is σ = 506983968. Its totient is φ = 84497324.

The previous prime is 253491967. The next prime is 253492033. The reversal of 253491978 is 879194352.

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

253491978 is an admirable number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21124326 + ... + 21124337.

It is an arithmetic number, because the mean of its divisors is an integer number (63372996).

Almost surely, 2^253491978 is an apocalyptic number.

253491978 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.

253491978 is a wasteful number, since it uses less digits than its factorization.

253491978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42248668.

The product of its digits is 544320, while the sum is 48.

The square root of 253491978 is about 15921.4314054987. The cubic root of 253491978 is about 632.8800513445.

The spelling of 253491978 in words is "two hundred fifty-three million, four hundred ninety-one thousand, nine hundred seventy-eight".