21876378 has 32 divisors (see below), whose sum is σ = 44945280. Its totient is φ = 7096320.

The previous prime is 21876377. The next prime is 21876389. The reversal of 21876378 is 87367812.

It is not an unprimeable number, because it can be changed into a prime (21876373) 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, 37626 + ... + 38202.

It is an arithmetic number, because the mean of its divisors is an integer number (1404540).

Almost surely, 2^21876378 is an apocalyptic number.

21876378 is an abundant number, since it is smaller than the sum of its proper divisors (23068902).

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

21876378 is a wasteful number, since it uses less digits than its factorization.

21876378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742.

The product of its digits is 112896, while the sum is 42.

The square root of 21876378 is about 4677.2190455441. The cubic root of 21876378 is about 279.6781079813.

The spelling of 21876378 in words is "twenty-one million, eight hundred seventy-six thousand, three hundred seventy-eight".