21849790 has 8 divisors (see below), whose sum is σ = 39329640. Its totient is φ = 8739912.

The previous prime is 21849757. The next prime is 21849797. The reversal of 21849790 is 9794812.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21849797) 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, 1092480 + ... + 1092499.

It is an arithmetic number, because the mean of its divisors is an integer number (4916205).

Almost surely, 2^21849790 is an apocalyptic number.

21849790 is a deficient number, since it is larger than the sum of its proper divisors (17479850).

21849790 is a wasteful number, since it uses less digits than its factorization.

21849790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2184986.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 21849790 is about 4674.3758941703. The cubic root of 21849790 is about 279.5647574667.

The spelling of 21849790 in words is "twenty-one million, eight hundred forty-nine thousand, seven hundred ninety".