253521990 has 48 divisors (see below), whose sum is σ = 660821616. Its totient is φ = 67435200.

The previous prime is 253521971. The next prime is 253521991. The reversal of 253521990 is 99125352.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (253521991) 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 23 ways as a sum of consecutive naturals, for example, 34545 + ... + 41235.

It is an arithmetic number, because the mean of its divisors is an integer number (13767117).

Almost surely, 2^253521990 is an apocalyptic number.

253521990 is an abundant number, since it is smaller than the sum of its proper divisors (407299626).

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

253521990 is a wasteful number, since it uses less digits than its factorization.

253521990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7125 (or 7122 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 253521990 is about 15922.3738808006. The cubic root of 253521990 is about 632.9050268180.

The spelling of 253521990 in words is "two hundred fifty-three million, five hundred twenty-one thousand, nine hundred ninety".