23129140 has 12 divisors (see below), whose sum is σ = 48571236. Its totient is φ = 9251648.

The previous prime is 23129111. The next prime is 23129159. The reversal of 23129140 is 4192132.

It can be written as a sum of positive squares in 2 ways, for example, as 3663396 + 19465744 = 1914^2 + 4412^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 578209 + ... + 578248.

It is an arithmetic number, because the mean of its divisors is an integer number (4047603).

Almost surely, 2^23129140 is an apocalyptic number.

23129140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23129140 is an abundant number, since it is smaller than the sum of its proper divisors (25442096).

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

23129140 is a wasteful number, since it uses less digits than its factorization.

23129140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156466 (or 1156464 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 23129140 is about 4809.2764528565. The cubic root of 23129140 is about 284.9179614081.

The spelling of 23129140 in words is "twenty-three million, one hundred twenty-nine thousand, one hundred forty".