80839947 has 12 divisors (see below), whose sum is σ = 114501176. Its totient is φ = 50722560.

The previous prime is 80839943. The next prime is 80839991. The reversal of 80839947 is 74993808.

It is not a de Polignac number, because 80839947 - 2² = 80839943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 80839896 and 80839905.

It is not an unprimeable number, because it can be changed into a prime (80839943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45754 + ... + 47487.

Almost surely, 2^80839947 is an apocalyptic number.

80839947 is a deficient number, since it is larger than the sum of its proper divisors (33661229).

80839947 is a wasteful number, since it uses less digits than its factorization.

80839947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93278 (or 93261 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 80839947 is about 8991.1037698383. The cubic root of 80839947 is about 432.3897000071.

It can be divided in two parts, 808 and 39947, that added together give a triangular number (40755 = T₂₈₅).

The spelling of 80839947 in words is "eighty million, eight hundred thirty-nine thousand, nine hundred forty-seven".