80439749 has 8 divisors (see below), whose sum is σ = 91187040. Its totient is φ = 70343856.

The previous prime is 80439703. The next prime is 80439757. The reversal of 80439749 is 94793408.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80439749 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 (80439449) 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, 162587 + ... + 163080.

It is an arithmetic number, because the mean of its divisors is an integer number (11398380).

Almost surely, 2^80439749 is an apocalyptic number.

It is an amenable number.

80439749 is a deficient number, since it is larger than the sum of its proper divisors (10747291).

80439749 is a wasteful number, since it uses less digits than its factorization.

80439749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325699.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 80439749 is about 8968.8209370017. The cubic root of 80439749 is about 431.6750045513.

The spelling of 80439749 in words is "eighty million, four hundred thirty-nine thousand, seven hundred forty-nine".