21399862 has 8 divisors (see below), whose sum is σ = 35017992. Its totient is φ = 9727200.

The previous prime is 21399839. The next prime is 21399901. The reversal of 21399862 is 26899312.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486339 + ... + 486382.

It is an arithmetic number, because the mean of its divisors is an integer number (4377249).

Almost surely, 2^21399862 is an apocalyptic number.

21399862 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21399862 is a deficient number, since it is larger than the sum of its proper divisors (13618130).

21399862 is a wasteful number, since it uses less digits than its factorization.

21399862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972734.

The product of its digits is 46656, while the sum is 40.

The square root of 21399862 is about 4625.9984868134. The cubic root of 21399862 is about 277.6325130718.

The spelling of 21399862 in words is "twenty-one million, three hundred ninety-nine thousand, eight hundred sixty-two".