23140638 has 48 divisors (see below), whose sum is σ = 54250560. Its totient is φ = 7100928.

The previous prime is 23140609. The next prime is 23140657. The reversal of 23140638 is 83604132.

It is a happy number.

23140638 is a `hidden beast` number, since 23 + 1 + 4 + 0 + 638 = 666.

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 23 ways as a sum of consecutive naturals, for example, 13578 + ... + 15186.

It is an arithmetic number, because the mean of its divisors is an integer number (1130220).

Almost surely, 2^23140638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 23140638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27125280).

23140638 is an abundant number, since it is smaller than the sum of its proper divisors (31109922).

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

23140638 is a wasteful number, since it uses less digits than its factorization.

23140638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1681 (or 1678 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 23140638 is about 4810.4717024425. The cubic root of 23140638 is about 284.9651665645.

The spelling of 23140638 in words is "twenty-three million, one hundred forty thousand, six hundred thirty-eight".