230723721 has 20 divisors (see below), whose sum is σ = 345975300. Its totient is φ = 153229536.

The previous prime is 230723663. The next prime is 230723723. The reversal of 230723721 is 127327032.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 22325625 + 208398096 = 4725^2 + 14436^2 .

It is not a de Polignac number, because 230723721 - 2¹⁰ = 230722697 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (230723723) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16495 + ... + 27083.

It is an arithmetic number, because the mean of its divisors is an integer number (17298765).

Almost surely, 2^230723721 is an apocalyptic number.

It is an amenable number.

230723721 is a deficient number, since it is larger than the sum of its proper divisors (115251579).

230723721 is a wasteful number, since it uses less digits than its factorization.

230723721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10870 (or 10861 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 27.

The square root of 230723721 is about 15189.5925225136. The cubic root of 230723721 is about 613.3345301318.

The spelling of 230723721 in words is "two hundred thirty million, seven hundred twenty-three thousand, seven hundred twenty-one".