23891409 has 16 divisors (see below), whose sum is σ = 37477440. Its totient is φ = 14990400.

The previous prime is 23891407. The next prime is 23891423. The reversal of 23891409 is 90419832.

It is not a de Polignac number, because 23891409 - 2¹ = 23891407 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23891407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25567 + ... + 26484.

It is an arithmetic number, because the mean of its divisors is an integer number (2342340).

Almost surely, 2^23891409 is an apocalyptic number.

It is an amenable number.

23891409 is a deficient number, since it is larger than the sum of its proper divisors (13586031).

23891409 is a wasteful number, since it uses less digits than its factorization.

23891409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52077 (or 52071 counting only the distinct ones).

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

The square root of 23891409 is about 4887.8838979665. The cubic root of 23891409 is about 288.0142137082.

The spelling of 23891409 in words is "twenty-three million, eight hundred ninety-one thousand, four hundred nine".