23409870 has 48 divisors (see below), whose sum is σ = 61765200. Its totient is φ = 5674240.

The previous prime is 23409847. The next prime is 23409877. The reversal of 23409870 is 7890432.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23409877) 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 23 ways as a sum of consecutive naturals, for example, 406 + ... + 6854.

It is an arithmetic number, because the mean of its divisors is an integer number (1286775).

Almost surely, 2^23409870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23409870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30882600).

23409870 is an abundant number, since it is smaller than the sum of its proper divisors (38355330).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23409870 is a wasteful number, since it uses less digits than its factorization.

23409870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6481 (or 6470 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 23409870 is about 4838.3747271165. The cubic root of 23409870 is about 286.0660596912.

Adding to 23409870 its sum of digits (33), we get a triangular number (23409903 = T₆₈₄₂).

The spelling of 23409870 in words is "twenty-three million, four hundred nine thousand, eight hundred seventy".