23721861 has 16 divisors (see below), whose sum is σ = 33755840. Its totient is φ = 14774400.

The previous prime is 23721857. The next prime is 23721869. The reversal of 23721861 is 16812732.

It is not a de Polignac number, because 23721861 - 2² = 23721857 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 (23721869) 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, 1311 + ... + 7011.

It is an arithmetic number, because the mean of its divisors is an integer number (2109740).

Almost surely, 2^23721861 is an apocalyptic number.

It is an amenable number.

23721861 is a deficient number, since it is larger than the sum of its proper divisors (10033979).

23721861 is a wasteful number, since it uses less digits than its factorization.

23721861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5796.

The product of its digits is 4032, while the sum is 30.

The square root of 23721861 is about 4870.5093162831. The cubic root of 23721861 is about 287.3312875299.

The spelling of 23721861 in words is "twenty-three million, seven hundred twenty-one thousand, eight hundred sixty-one".