23913989 has 16 divisors (see below), whose sum is σ = 28354560. Its totient is φ = 19926000.

The previous prime is 23913983. The next prime is 23913991. The reversal of 23913989 is 98931932.

It is a cyclic number.

It is not a de Polignac number, because 23913989 - 2¹⁶ = 23848453 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23913983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4634 + ... + 8324.

It is an arithmetic number, because the mean of its divisors is an integer number (1772160).

Almost surely, 2^23913989 is an apocalyptic number.

It is an amenable number.

23913989 is a deficient number, since it is larger than the sum of its proper divisors (4440571).

23913989 is a wasteful number, since it uses less digits than its factorization.

23913989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3752.

The product of its digits is 104976, while the sum is 44.

The square root of 23913989 is about 4890.1931454698. The cubic root of 23913989 is about 288.1049201378.

The spelling of 23913989 in words is "twenty-three million, nine hundred thirteen thousand, nine hundred eighty-nine".