12021439 has 8 divisors (see below), whose sum is σ = 12247040. Its totient is φ = 11798136.

The previous prime is 12021403. The next prime is 12021473. The reversal of 12021439 is 93412021.

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

It is a cyclic number.

It is not a de Polignac number, because 12021439 - 2⁷ = 12021311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021539) 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, 12622 + ... + 13540.

It is an arithmetic number, because the mean of its divisors is an integer number (1530880).

Almost surely, 2^12021439 is an apocalyptic number.

12021439 is a deficient number, since it is larger than the sum of its proper divisors (225601).

12021439 is a wasteful number, since it uses less digits than its factorization.

12021439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 12021439 is about 3467.1946873517. The cubic root of 12021439 is about 229.0791092216.

The spelling of 12021439 in words is "twelve million, twenty-one thousand, four hundred thirty-nine".