23361989 has 4 divisors (see below), whose sum is σ = 26699424. Its totient is φ = 20024556.

The previous prime is 23361983. The next prime is 23361991. The reversal of 23361989 is 98916332.

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.

It is a cyclic number.

It is not a de Polignac number, because 23361989 - 2¹⁶ = 23296453 is a prime.

It is a super-2 number, since 2×23361989² = 1091565060072242, which contains 22 as substring.

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 (23361983) 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 3 ways as a sum of consecutive naturals, for example, 1668707 + ... + 1668720.

It is an arithmetic number, because the mean of its divisors is an integer number (6674856).

Almost surely, 2^23361989 is an apocalyptic number.

It is an amenable number.

23361989 is a deficient number, since it is larger than the sum of its proper divisors (3337435).

23361989 is an equidigital number, since it uses as much as digits as its factorization.

23361989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3337434.

The product of its digits is 69984, while the sum is 41.

The square root of 23361989 is about 4833.4241485721. The cubic root of 23361989 is about 285.8708930367.

Adding to 23361989 its sum of digits (41), we get a triangular number (23362030 = T₆₈₃₅).

The spelling of 23361989 in words is "twenty-three million, three hundred sixty-one thousand, nine hundred eighty-nine".