23187140 has 24 divisors (see below), whose sum is σ = 49882392. Its totient is φ = 9048320.

The previous prime is 23187139. The next prime is 23187149. The reversal of 23187140 is 4178132.

It can be written as a sum of positive squares in 4 ways, for example, as 12544 + 23174596 = 112^2 + 4814^2 .

It is a super-2 number, since 2×23187140² = 1075286922759200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (23187149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13319 + ... + 14958.

It is an arithmetic number, because the mean of its divisors is an integer number (2078433).

Almost surely, 2^23187140 is an apocalyptic number.

23187140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23187140 is an abundant number, since it is smaller than the sum of its proper divisors (26695252).

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

23187140 is a wasteful number, since it uses less digits than its factorization.

23187140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28327 (or 28325 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 23187140 is about 4815.3026903820. The cubic root of 23187140 is about 285.1559216572.

The spelling of 23187140 in words is "twenty-three million, one hundred eighty-seven thousand, one hundred forty".