23021989 has 4 divisors (see below), whose sum is σ = 23042124. Its totient is φ = 23001856.

The previous prime is 23021987. The next prime is 23021993. The reversal of 23021989 is 98912032.

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 13380964 + 9641025 = 3658^2 + 3105^2 .

It is a cyclic number.

It is not a de Polignac number, because 23021989 - 2¹ = 23021987 is a prime.

It is a super-2 number, since 2×23021989² = 1060023955032242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23021983) 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, 8242 + ... + 10675.

It is an arithmetic number, because the mean of its divisors is an integer number (5760531).

Almost surely, 2^23021989 is an apocalyptic number.

It is an amenable number.

23021989 is a deficient number, since it is larger than the sum of its proper divisors (20135).

23021989 is a wasteful number, since it uses less digits than its factorization.

23021989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20134.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 23021989 is about 4798.1234873646. The cubic root of 23021989 is about 284.4772978015.

The spelling of 23021989 in words is "twenty-three million, twenty-one thousand, nine hundred eighty-nine".