23978190 has 128 divisors (see below), whose sum is σ = 66355200. Its totient is φ = 5512320.

The previous prime is 23978179. The next prime is 23978233. The reversal of 23978190 is 9187932.

It is a super-4 number, since 4×23978190⁴ (a number of 31 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 406381 + ... + 406439.

It is an arithmetic number, because the mean of its divisors is an integer number (518400).

Almost surely, 2^23978190 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23978190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33177600).

23978190 is an abundant number, since it is smaller than the sum of its proper divisors (42377010).

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

23978190 is a wasteful number, since it uses less digits than its factorization.

23978190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 23978190 is about 4896.7530058193. The cubic root of 23978190 is about 288.3625112939.

The spelling of 23978190 in words is "twenty-three million, nine hundred seventy-eight thousand, one hundred ninety".