23809149 has 36 divisors (see below), whose sum is σ = 43093596. Its totient is φ = 12555648.

The previous prime is 23809141. The next prime is 23809183. The reversal of 23809149 is 94190832.

It can be written as a sum of positive squares in 2 ways, for example, as 1483524 + 22325625 = 1218^2 + 4725^2 .

It is not a de Polignac number, because 23809149 - 2³ = 23809141 is a prime.

It is a super-2 number, since 2×23809149² = 1133751152208402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23809141) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3657 + ... + 7809.

Almost surely, 2^23809149 is an apocalyptic number.

It is an amenable number.

23809149 is a deficient number, since it is larger than the sum of its proper divisors (19284447).

23809149 is a wasteful number, since it uses less digits than its factorization.

23809149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4186 (or 4176 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 23809149 is about 4879.4619580441. The cubic root of 23809149 is about 287.6832817465.

The spelling of 23809149 in words is "twenty-three million, eight hundred nine thousand, one hundred forty-nine".