23977813 has 8 divisors (see below), whose sum is σ = 24737240. Its totient is φ = 23224320.

The previous prime is 23977801. The next prime is 23977817. The reversal of 23977813 is 31877932.

23977813 = 3462² + 3463².

It can be written as a sum of positive squares in 4 ways, for example, as 4635409 + 19342404 = 2153^2 + 4398^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23977813 - 2⁹ = 23977301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23977817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7573 + ... + 10261.

It is an arithmetic number, because the mean of its divisors is an integer number (3092155).

Almost surely, 2^23977813 is an apocalyptic number.

23977813 is the 3463-rd centered square number.

It is an amenable number.

23977813 is a deficient number, since it is larger than the sum of its proper divisors (759427).

23977813 is a wasteful number, since it uses less digits than its factorization.

23977813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2967.

The product of its digits is 63504, while the sum is 40.

The square root of 23977813 is about 4896.7145107715. The cubic root of 23977813 is about 288.3610000145.

The spelling of 23977813 in words is "twenty-three million, nine hundred seventy-seven thousand, eight hundred thirteen".