139257805 has 8 divisors (see below), whose sum is σ = 167173632. Its totient is φ = 111363408.

The previous prime is 139257773. The next prime is 139257817. The reversal of 139257805 is 508752931.

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 139257805 - 2⁵ = 139257773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19104 + ... + 25366.

It is an arithmetic number, because the mean of its divisors is an integer number (20896704).

Almost surely, 2^139257805 is an apocalyptic number.

It is an amenable number.

139257805 is a deficient number, since it is larger than the sum of its proper divisors (27915827).

139257805 is an equidigital number, since it uses as much as digits as its factorization.

139257805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10715.

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 139257805 is about 11800.7544250357. The cubic root of 139257805 is about 518.3302022008.

The spelling of 139257805 in words is "one hundred thirty-nine million, two hundred fifty-seven thousand, eight hundred five".