80142439 has 4 divisors (see below), whose sum is σ = 86307256. Its totient is φ = 73977624.

The previous prime is 80142431. The next prime is 80142449. The reversal of 80142439 is 93424108.

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 80142439 - 2³ = 80142431 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80142439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80142431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3082389 + ... + 3082414.

It is an arithmetic number, because the mean of its divisors is an integer number (21576814).

Almost surely, 2^80142439 is an apocalyptic number.

80142439 is a deficient number, since it is larger than the sum of its proper divisors (6164817).

80142439 is a wasteful number, since it uses less digits than its factorization.

80142439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6164816.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 80142439 is about 8952.2309509976. The cubic root of 80142439 is about 431.1425159842.

The spelling of 80142439 in words is "eighty million, one hundred forty-two thousand, four hundred thirty-nine".