21863438 has 8 divisors (see below), whose sum is σ = 33096360. Its totient is φ = 10831320.

The previous prime is 21863423. The next prime is 21863483. The reversal of 21863438 is 83436812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21863398 and 21863407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49928 + ... + 50363.

It is an arithmetic number, because the mean of its divisors is an integer number (4137045).

Almost surely, 2^21863438 is an apocalyptic number.

21863438 is a deficient number, since it is larger than the sum of its proper divisors (11232922).

21863438 is a wasteful number, since it uses less digits than its factorization.

21863438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100402.

The product of its digits is 27648, while the sum is 35.

The square root of 21863438 is about 4675.8355403072. The cubic root of 21863438 is about 279.6229533831.

The spelling of 21863438 in words is "twenty-one million, eight hundred sixty-three thousand, four hundred thirty-eight".