23012989 has 4 divisors (see below), whose sum is σ = 23070780. Its totient is φ = 22955200.

The previous prime is 23012963. The next prime is 23012993. The reversal of 23012989 is 98921032.

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 20548089 + 2464900 = 4533^2 + 1570^2 .

It is a cyclic number.

It is not a de Polignac number, because 23012989 - 2⁷ = 23012861 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23012909) 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, 28294 + ... + 29095.

It is an arithmetic number, because the mean of its divisors is an integer number (5767695).

Almost surely, 2^23012989 is an apocalyptic number.

It is an amenable number.

23012989 is a deficient number, since it is larger than the sum of its proper divisors (57791).

23012989 is an equidigital number, since it uses as much as digits as its factorization.

23012989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57790.

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

The square root of 23012989 is about 4797.1855290368. The cubic root of 23012989 is about 284.4402226761.

The spelling of 23012989 in words is "twenty-three million, twelve thousand, nine hundred eighty-nine".