80857139 has 8 divisors (see below), whose sum is σ = 88294320. Its totient is φ = 73434400.

The previous prime is 80857129. The next prime is 80857169. The reversal of 80857139 is 93175808.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 80857139 - 2⁸ = 80856883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 80857096 and 80857105.

It is not an unprimeable number, because it can be changed into a prime (80857129) 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, 10529 + ... + 16509.

It is an arithmetic number, because the mean of its divisors is an integer number (11036790).

Almost surely, 2^80857139 is an apocalyptic number.

80857139 is a deficient number, since it is larger than the sum of its proper divisors (7437181).

80857139 is a wasteful number, since it uses less digits than its factorization.

80857139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7221.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 80857139 is about 8992.0597751572. The cubic root of 80857139 is about 432.4203495275.

The spelling of 80857139 in words is "eighty million, eight hundred fifty-seven thousand, one hundred thirty-nine".