21839469 has 8 divisors (see below), whose sum is σ = 30058752. Its totient is φ = 14089920.

The previous prime is 21839459. The next prime is 21839473. The reversal of 21839469 is 96493812.

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

It is not a de Polignac number, because 21839469 - 2⁵ = 21839437 is a prime.

It is a super-2 number, since 2×21839469² = 953924812403922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21839469.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21839459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117324 + ... + 117509.

It is an arithmetic number, because the mean of its divisors is an integer number (3757344).

Almost surely, 2^21839469 is an apocalyptic number.

It is an amenable number.

21839469 is a deficient number, since it is larger than the sum of its proper divisors (8219283).

21839469 is a wasteful number, since it uses less digits than its factorization.

21839469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234867.

The product of its digits is 93312, while the sum is 42.

The square root of 21839469 is about 4673.2717661185. The cubic root of 21839469 is about 279.5207319894.

The spelling of 21839469 in words is "twenty-one million, eight hundred thirty-nine thousand, four hundred sixty-nine".