23691638 has 4 divisors (see below), whose sum is σ = 35537460. Its totient is φ = 11845818.

The previous prime is 23691631. The next prime is 23691643. The reversal of 23691638 is 83619632.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×23691638² = 1122587422246088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23691631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5922908 + ... + 5922911.

It is an arithmetic number, because the mean of its divisors is an integer number (8884365).

Almost surely, 2^23691638 is an apocalyptic number.

23691638 is a deficient number, since it is larger than the sum of its proper divisors (11845822).

23691638 is a wasteful number, since it uses less digits than its factorization.

23691638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11845821.

The product of its digits is 46656, while the sum is 38.

The square root of 23691638 is about 4867.4056744841. The cubic root of 23691638 is about 287.2092102037.

The spelling of 23691638 in words is "twenty-three million, six hundred ninety-one thousand, six hundred thirty-eight".