23428909 has 12 divisors (see below), whose sum is σ = 27445500. Its totient is φ = 19940928.

The previous prime is 23428883. The next prime is 23428921. The reversal of 23428909 is 90982432.

It can be written as a sum of positive squares in 2 ways, for example, as 7452900 + 15976009 = 2730^2 + 3997^2 .

It is not a de Polignac number, because 23428909 - 2¹⁹ = 22904621 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 (23428969) 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, 5697 + ... + 8905.

It is an arithmetic number, because the mean of its divisors is an integer number (2287125).

Almost surely, 2^23428909 is an apocalyptic number.

It is an amenable number.

23428909 is a deficient number, since it is larger than the sum of its proper divisors (4016591).

23428909 is a wasteful number, since it uses less digits than its factorization.

23428909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3372 (or 3365 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 23428909 is about 4840.3418267722. The cubic root of 23428909 is about 286.1435901783.

The spelling of 23428909 in words is "twenty-three million, four hundred twenty-eight thousand, nine hundred nine".