21849654 has 8 divisors (see below), whose sum is σ = 43699320. Its totient is φ = 7283216.

The previous prime is 21849643. The next prime is 21849671. The reversal of 21849654 is 45694812.

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

21849654 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1820799 + ... + 1820810.

It is an arithmetic number, because the mean of its divisors is an integer number (5462415).

Almost surely, 2^21849654 is an apocalyptic number.

21849654 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.

21849654 is a wasteful number, since it uses less digits than its factorization.

21849654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3641614.

The product of its digits is 69120, while the sum is 39.

The square root of 21849654 is about 4674.3613467510. The cubic root of 21849654 is about 279.5641774323.

The spelling of 21849654 in words is "twenty-one million, eight hundred forty-nine thousand, six hundred fifty-four".