80921439 has 12 divisors (see below), whose sum is σ = 120657472. Its totient is φ = 52207200.

The previous prime is 80921419. The next prime is 80921443. The reversal of 80921439 is 93412908.

It is not a de Polignac number, because 80921439 - 2⁷ = 80921311 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 (80921419) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144742 + ... + 145299.

Almost surely, 2^80921439 is an apocalyptic number.

80921439 is a deficient number, since it is larger than the sum of its proper divisors (39736033).

80921439 is a wasteful number, since it uses less digits than its factorization.

80921439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290078 (or 290075 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 80921439 is about 8995.6344412165. The cubic root of 80921439 is about 432.5349436611.

The spelling of 80921439 in words is "eighty million, nine hundred twenty-one thousand, four hundred thirty-nine".