115723021 has 4 divisors (see below), whose sum is σ = 119713500. Its totient is φ = 111732544.

The previous prime is 115723007. The next prime is 115723043. The reversal of 115723021 is 120327511.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67420521 + 48302500 = 8211^2 + 6950^2 .

It is a cyclic number.

It is not a de Polignac number, because 115723021 - 2⁵ = 115722989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 115722983 and 115723001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115723001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1995196 + ... + 1995253.

It is an arithmetic number, because the mean of its divisors is an integer number (29928375).

Almost surely, 2^115723021 is an apocalyptic number.

It is an amenable number.

115723021 is a deficient number, since it is larger than the sum of its proper divisors (3990479).

115723021 is an equidigital number, since it uses as much as digits as its factorization.

115723021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3990478.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 115723021 is about 10757.4635021458. The cubic root of 115723021 is about 487.3114182714.

The spelling of 115723021 in words is "one hundred fifteen million, seven hundred twenty-three thousand, twenty-one".