23803721 has 2 divisors, whose sum is σ = 23803722. Its totient is φ = 23803720.

The previous prime is 23803711. The next prime is 23803729. The reversal of 23803721 is 12730832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22458121 + 1345600 = 4739^2 + 1160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23803721 is a prime.

It is not a weakly prime, because it can be changed into another prime (23803729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11901860 + 11901861.

It is an arithmetic number, because the mean of its divisors is an integer number (11901861).

Almost surely, 2^23803721 is an apocalyptic number.

It is an amenable number.

23803721 is a deficient number, since it is larger than the sum of its proper divisors (1).

23803721 is an equidigital number, since it uses as much as digits as its factorization.

23803721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 23803721 is about 4878.9057174740. The cubic root of 23803721 is about 287.6614181128.

The spelling of 23803721 in words is "twenty-three million, eight hundred three thousand, seven hundred twenty-one".