23218638 has 32 divisors (see below), whose sum is σ = 48701952. Its totient is φ = 7365600.

The previous prime is 23218631. The next prime is 23218673. The reversal of 23218638 is 83681232.

It is a junction number, because it is equal to n+sod(n) for n = 23218599 and 23218608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23218631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42648 + ... + 43188.

It is an arithmetic number, because the mean of its divisors is an integer number (1521936).

Almost surely, 2^23218638 is an apocalyptic number.

23218638 is an abundant number, since it is smaller than the sum of its proper divisors (25483314).

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

23218638 is a wasteful number, since it uses less digits than its factorization.

23218638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880.

The product of its digits is 13824, while the sum is 33.

The square root of 23218638 is about 4818.5721951632. The cubic root of 23218638 is about 285.2849842501.

The spelling of 23218638 in words is "twenty-three million, two hundred eighteen thousand, six hundred thirty-eight".