21848406 has 8 divisors (see below), whose sum is σ = 43696824. Its totient is φ = 7282800.

The previous prime is 21848401. The next prime is 21848441. The reversal of 21848406 is 60484812.

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

21848406 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21848401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1820695 + ... + 1820706.

It is an arithmetic number, because the mean of its divisors is an integer number (5462103).

Almost surely, 2^21848406 is an apocalyptic number.

21848406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21848406 is a wasteful number, since it uses less digits than its factorization.

21848406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3641406.

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 21848406 is about 4674.2278506722. The cubic root of 21848406 is about 279.5588546518.

The spelling of 21848406 in words is "twenty-one million, eight hundred forty-eight thousand, four hundred six".