80405939 has 4 divisors (see below), whose sum is σ = 80680656. Its totient is φ = 80131224.

The previous prime is 80405917. The next prime is 80405957. The reversal of 80405939 is 93950408.

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

It is a cyclic number.

It is not a de Polignac number, because 80405939 - 2²⁰ = 79357363 is a prime.

It is a super-3 number, since 3×80405939³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80405639) 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, 136919 + ... + 137504.

It is an arithmetic number, because the mean of its divisors is an integer number (20170164).

Almost surely, 2^80405939 is an apocalyptic number.

80405939 is a deficient number, since it is larger than the sum of its proper divisors (274717).

80405939 is a wasteful number, since it uses less digits than its factorization.

80405939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274716.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 80405939 is about 8966.9358757605. The cubic root of 80405939 is about 431.6145163085.

The spelling of 80405939 in words is "eighty million, four hundred five thousand, nine hundred thirty-nine".