139691086 has 16 divisors (see below), whose sum is σ = 217047600. Its totient is φ = 67348288.

The previous prime is 139691081. The next prime is 139691129. The reversal of 139691086 is 680196931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139691081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72066 + ... + 73978.

It is an arithmetic number, because the mean of its divisors is an integer number (13565475).

Almost surely, 2^139691086 is an apocalyptic number.

139691086 is a deficient number, since it is larger than the sum of its proper divisors (77356514).

139691086 is a wasteful number, since it uses less digits than its factorization.

139691086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3203.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 139691086 is about 11819.0983581659. The cubic root of 139691086 is about 518.8672160533.

The spelling of 139691086 in words is "one hundred thirty-nine million, six hundred ninety-one thousand, eighty-six".