139861686 has 16 divisors (see below), whose sum is σ = 296177904. Its totient is φ = 43878144.

The previous prime is 139861663. The next prime is 139861721. The reversal of 139861686 is 686168931.

139861686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×139861686² = 39122582421525192, which contains 22 as substring.

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, 685495 + ... + 685698.

It is an arithmetic number, because the mean of its divisors is an integer number (18511119).

Almost surely, 2^139861686 is an apocalyptic number.

139861686 is an abundant number, since it is smaller than the sum of its proper divisors (156316218).

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

139861686 is a wasteful number, since it uses less digits than its factorization.

139861686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371215.

The product of its digits is 373248, while the sum is 48.

The square root of 139861686 is about 11826.3132885951. The cubic root of 139861686 is about 519.0783551198.

The spelling of 139861686 in words is "one hundred thirty-nine million, eight hundred sixty-one thousand, six hundred eighty-six".