23719945 has 4 divisors (see below), whose sum is σ = 28463940. Its totient is φ = 18975952.

The previous prime is 23719939. The next prime is 23719967. The reversal of 23719945 is 54991732.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16168441 + 7551504 = 4021^2 + 2748^2 .

It is a cyclic number.

It is not a de Polignac number, because 23719945 - 2³ = 23719937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23719898 and 23719907.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2371990 + ... + 2371999.

It is an arithmetic number, because the mean of its divisors is an integer number (7115985).

Almost surely, 2^23719945 is an apocalyptic number.

It is an amenable number.

23719945 is a deficient number, since it is larger than the sum of its proper divisors (4743995).

23719945 is an equidigital number, since it uses as much as digits as its factorization.

23719945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4743994.

The product of its digits is 68040, while the sum is 40.

The square root of 23719945 is about 4870.3126183029. The cubic root of 23719945 is about 287.3235514650.

The spelling of 23719945 in words is "twenty-three million, seven hundred nineteen thousand, nine hundred forty-five".