253218408 has 32 divisors (see below), whose sum is σ = 660571200. Its totient is φ = 80736128.

The previous prime is 253218367. The next prime is 253218421. The reversal of 253218408 is 804812352.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 228813 + ... + 229916.

It is an arithmetic number, because the mean of its divisors is an integer number (20642850).

Almost surely, 2^253218408 is an apocalyptic number.

It is an amenable number.

253218408 is an abundant number, since it is smaller than the sum of its proper divisors (407352792).

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

253218408 is a wasteful number, since it uses less digits than its factorization.

253218408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458761 (or 458757 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 253218408 is about 15912.8378361623. The cubic root of 253218408 is about 632.6523001314.

The spelling of 253218408 in words is "two hundred fifty-three million, two hundred eighteen thousand, four hundred eight".