80140639 has 2 divisors, whose sum is σ = 80140640. Its totient is φ = 80140638.

The previous prime is 80140607. The next prime is 80140679. The reversal of 80140639 is 93604108.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 80140639 - 2⁵ = 80140607 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80140639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80140679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40070319 + 40070320.

It is an arithmetic number, because the mean of its divisors is an integer number (40070320).

Almost surely, 2^80140639 is an apocalyptic number.

80140639 is a deficient number, since it is larger than the sum of its proper divisors (1).

80140639 is an equidigital number, since it uses as much as digits as its factorization.

80140639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 80140639 is about 8952.1304168337. The cubic root of 80140639 is about 431.1392881383.

The spelling of 80140639 in words is "eighty million, one hundred forty thousand, six hundred thirty-nine".