139809786 has 32 divisors (see below), whose sum is σ = 283989888. Its totient is φ = 45880320.

The previous prime is 139809773. The next prime is 139809797. The reversal of 139809786 is 687908931.

It is a super-2 number, since 2×139809786² = 39093552522731592, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135091 + ... + 136121.

It is an arithmetic number, because the mean of its divisors is an integer number (8874684).

Almost surely, 2^139809786 is an apocalyptic number.

139809786 is an abundant number, since it is smaller than the sum of its proper divisors (144180102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139809786 is a wasteful number, since it uses less digits than its factorization.

139809786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366.

The product of its (nonzero) digits is 653184, while the sum is 51.

The square root of 139809786 is about 11824.1188255193. The cubic root of 139809786 is about 519.0141404889.

The spelling of 139809786 in words is "one hundred thirty-nine million, eight hundred nine thousand, seven hundred eighty-six".