253209720 has 64 divisors (see below), whose sum is σ = 764082720. Its totient is φ = 67126784.

The previous prime is 253209707. The next prime is 253209731. The reversal of 253209720 is 27902352.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14662 + ... + 26858.

Almost surely, 2^253209720 is an apocalyptic number.

253209720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 253209720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (382041360).

253209720 is an abundant number, since it is smaller than the sum of its proper divisors (510873000).

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

253209720 is a wasteful number, since it uses less digits than its factorization.

253209720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12384 (or 12380 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 253209720 is about 15912.5648466864. The cubic root of 253209720 is about 632.6450645515.

The spelling of 253209720 in words is "two hundred fifty-three million, two hundred nine thousand, seven hundred twenty".