253768987 has 4 divisors (see below), whose sum is σ = 255767296. Its totient is φ = 251770680.

The previous prime is 253768973. The next prime is 253769003. The reversal of 253768987 is 789867352.

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

It is a cyclic number.

It is not a de Polignac number, because 253768987 - 2⁷ = 253768859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (253768687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 998964 + ... + 999217.

It is an arithmetic number, because the mean of its divisors is an integer number (63941824).

Almost surely, 2^253768987 is an apocalyptic number.

253768987 is a deficient number, since it is larger than the sum of its proper divisors (1998309).

253768987 is a wasteful number, since it uses less digits than its factorization.

253768987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1998308.

The product of its digits is 5080320, while the sum is 55.

The square root of 253768987 is about 15930.1282794584. The cubic root of 253768987 is about 633.1104986760.

The spelling of 253768987 in words is "two hundred fifty-three million, seven hundred sixty-eight thousand, nine hundred eighty-seven".