23428989 has 12 divisors (see below), whose sum is σ = 33954076. Its totient is φ = 15567552.

The previous prime is 23428981. The next prime is 23428997. The reversal of 23428989 is 98982432.

It is an interprime number because it is at equal distance from previous prime (23428981) and next prime (23428997).

It can be written as a sum of positive squares in 2 ways, for example, as 11108889 + 12320100 = 3333^2 + 3510^2 .

It is not a de Polignac number, because 23428989 - 2³ = 23428981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23428981) 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, 1342 + ... + 6975.

Almost surely, 2^23428989 is an apocalyptic number.

It is an amenable number.

23428989 is a deficient number, since it is larger than the sum of its proper divisors (10525087).

23428989 is a wasteful number, since it uses less digits than its factorization.

23428989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8636 (or 8633 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 23428989 is about 4840.3500906443. The cubic root of 23428989 is about 286.1439158651.

The spelling of 23428989 in words is "twenty-three million, four hundred twenty-eight thousand, nine hundred eighty-nine".