23398809 has 32 divisors (see below), whose sum is σ = 36888576. Its totient is φ = 12916800.

The previous prime is 23398801. The next prime is 23398841. The reversal of 23398809 is 90889332.

It is not a de Polignac number, because 23398809 - 2³ = 23398801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23398801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 148959 + ... + 149115.

It is an arithmetic number, because the mean of its divisors is an integer number (1152768).

Almost surely, 2^23398809 is an apocalyptic number.

It is an amenable number.

23398809 is a deficient number, since it is larger than the sum of its proper divisors (13489767).

23398809 is a wasteful number, since it uses less digits than its factorization.

23398809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 23398809 is about 4837.2315429386. The cubic root of 23398809 is about 286.0209978552.

The spelling of 23398809 in words is "twenty-three million, three hundred ninety-eight thousand, eight hundred nine".