253720731 has 16 divisors (see below), whose sum is σ = 371710080. Its totient is φ = 152661120.

The previous prime is 253720693. The next prime is 253720763. The reversal of 253720731 is 137027352.

It is not a de Polignac number, because 253720731 - 2⁶ = 253720667 is a prime.

It is a super-2 number, since 2×253720731² = 128748418678348722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (253721731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23070 + ... + 32243.

It is an arithmetic number, because the mean of its divisors is an integer number (23231880).

Almost surely, 2^253720731 is an apocalyptic number.

253720731 is a deficient number, since it is larger than the sum of its proper divisors (117989349).

253720731 is a wasteful number, since it uses less digits than its factorization.

253720731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55466.

The product of its (nonzero) digits is 8820, while the sum is 30.

The square root of 253720731 is about 15928.6135931537. The cubic root of 253720731 is about 633.0703659588.

The spelling of 253720731 in words is "two hundred fifty-three million, seven hundred twenty thousand, seven hundred thirty-one".