23139140 has 24 divisors (see below), whose sum is σ = 48709080. Its totient is φ = 9233408.

The previous prime is 23139139. The next prime is 23139143. The reversal of 23139140 is 4193132.

It can be written as a sum of positive squares in 4 ways, for example, as 9947716 + 13191424 = 3154^2 + 3632^2 .

It is not an unprimeable number, because it can be changed into a prime (23139143) 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, 9044 + ... + 11316.

It is an arithmetic number, because the mean of its divisors is an integer number (2029545).

Almost surely, 2^23139140 is an apocalyptic number.

23139140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23139140 is an abundant number, since it is smaller than the sum of its proper divisors (25569940).

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

23139140 is a wasteful number, since it uses less digits than its factorization.

23139140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2791 (or 2789 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 23139140 is about 4810.3159979361. The cubic root of 23139140 is about 284.9590173963.

The spelling of 23139140 in words is "twenty-three million, one hundred thirty-nine thousand, one hundred forty".