253887921 has 24 divisors (see below), whose sum is σ = 419837184. Its totient is φ = 144829440.

The previous prime is 253887919. The next prime is 253887943. The reversal of 253887921 is 129788352.

It is a happy number.

It is not a de Polignac number, because 253887921 - 2¹ = 253887919 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (253887521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37240 + ... + 43526.

It is an arithmetic number, because the mean of its divisors is an integer number (17493216).

Almost surely, 2^253887921 is an apocalyptic number.

253887921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

253887921 is a deficient number, since it is larger than the sum of its proper divisors (165949263).

253887921 is a wasteful number, since it uses less digits than its factorization.

253887921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6941 (or 6938 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 253887921 is about 15933.8608315750. The cubic root of 253887921 is about 633.2093899348.

The spelling of 253887921 in words is "two hundred fifty-three million, eight hundred eighty-seven thousand, nine hundred twenty-one".