210253640 has 16 divisors (see below), whose sum is σ = 473070780. Its totient is φ = 84101440.

The previous prime is 210253613. The next prime is 210253657. The reversal of 210253640 is 46352012.

It can be written as a sum of positive squares in 2 ways, for example, as 200902276 + 9351364 = 14174^2 + 3058^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2628131 + ... + 2628210.

Almost surely, 2^210253640 is an apocalyptic number.

210253640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210253640 is an abundant number, since it is smaller than the sum of its proper divisors (262817140).

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

210253640 is a wasteful number, since it uses less digits than its factorization.

210253640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5256352 (or 5256348 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 210253640 is about 14500.1255166981. The cubic root of 210253640 is about 594.6314031811.

The spelling of 210253640 in words is "two hundred ten million, two hundred fifty-three thousand, six hundred forty".