139877309 has 32 divisors (see below), whose sum is σ = 175561344. Its totient is φ = 109486080.

The previous prime is 139877303. The next prime is 139877317. The reversal of 139877309 is 903778931.

It is not a de Polignac number, because 139877309 - 2²⁰ = 138828733 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 (139877303) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 396077 + ... + 396429.

It is an arithmetic number, because the mean of its divisors is an integer number (5486292).

Almost surely, 2^139877309 is an apocalyptic number.

It is an amenable number.

139877309 is a deficient number, since it is larger than the sum of its proper divisors (35684035).

139877309 is a wasteful number, since it uses less digits than its factorization.

139877309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 557.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 139877309 is about 11826.9737887593. The cubic root of 139877309 is about 519.0976819739.

The spelling of 139877309 in words is "one hundred thirty-nine million, eight hundred seventy-seven thousand, three hundred nine".