23019989 has 12 divisors (see below), whose sum is σ = 24944364. Its totient is φ = 21170304.

The previous prime is 23019979. The next prime is 23020009. The reversal of 23019989 is 98991032.

It can be written as a sum of positive squares in 2 ways, for example, as 6682225 + 16337764 = 2585^2 + 4042^2 .

It is not a de Polignac number, because 23019989 - 2¹⁶ = 22954453 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23019959) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37247 + ... + 37859.

It is an arithmetic number, because the mean of its divisors is an integer number (2078697).

Almost surely, 2^23019989 is an apocalyptic number.

It is an amenable number.

23019989 is a deficient number, since it is larger than the sum of its proper divisors (1924375).

23019989 is an equidigital number, since it uses as much as digits as its factorization.

23019989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724 (or 677 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 23019989 is about 4797.9150680269. The cubic root of 23019989 is about 284.4690597199.

The spelling of 23019989 in words is "twenty-three million, nineteen thousand, nine hundred eighty-nine".