23870509 has 8 divisors (see below), whose sum is σ = 26593560. Its totient is φ = 21274176.

The previous prime is 23870507. The next prime is 23870519. The reversal of 23870509 is 90507832.

It can be written as a sum of positive squares in 4 ways, for example, as 75625 + 23794884 = 275^2 + 4878^2 .

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 23870509 - 2¹ = 23870507 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23870503) 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 7 ways as a sum of consecutive naturals, for example, 31282 + ... + 32035.

It is an arithmetic number, because the mean of its divisors is an integer number (3324195).

Almost surely, 2^23870509 is an apocalyptic number.

23870509 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

23870509 is a deficient number, since it is larger than the sum of its proper divisors (2723051).

23870509 is a wasteful number, since it uses less digits than its factorization.

23870509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63359.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 23870509 is about 4885.7454907107. The cubic root of 23870509 is about 287.9302050842.

The spelling of 23870509 in words is "twenty-three million, eight hundred seventy thousand, five hundred nine".