80438021 has 4 divisors (see below), whose sum is σ = 80491500. Its totient is φ = 80384544.

The previous prime is 80438011. The next prime is 80438027. The reversal of 80438021 is 12083408.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57532225 + 22905796 = 7585^2 + 4786^2 .

It is a cyclic number.

It is not a de Polignac number, because 80438021 - 2¹⁴ = 80421637 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 (80438027) 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, 24416 + ... + 27513.

It is an arithmetic number, because the mean of its divisors is an integer number (20122875).

Almost surely, 2^80438021 is an apocalyptic number.

It is an amenable number.

80438021 is a deficient number, since it is larger than the sum of its proper divisors (53479).

80438021 is a wasteful number, since it uses less digits than its factorization.

80438021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53478.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 80438021 is about 8968.7246027515. The cubic root of 80438021 is about 431.6719134603.

The spelling of 80438021 in words is "eighty million, four hundred thirty-eight thousand, twenty-one".