23428709 has 4 divisors (see below), whose sum is σ = 23439840. Its totient is φ = 23417580.

The previous prime is 23428673. The next prime is 23428739. The reversal of 23428709 is 90782432.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 23428709 - 2²⁰ = 22380133 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 (23428739) 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, 1337 + ... + 6974.

It is an arithmetic number, because the mean of its divisors is an integer number (5859960).

Almost surely, 2^23428709 is an apocalyptic number.

It is an amenable number.

23428709 is a deficient number, since it is larger than the sum of its proper divisors (11131).

23428709 is an equidigital number, since it uses as much as digits as its factorization.

23428709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11130.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 23428709 is about 4840.3211670301. The cubic root of 23428709 is about 286.1427759580.

The spelling of 23428709 in words is "twenty-three million, four hundred twenty-eight thousand, seven hundred nine".