139691306 has 8 divisors (see below), whose sum is σ = 220565280. Its totient is φ = 66169548.

The previous prime is 139691303. The next prime is 139691309. The reversal of 139691306 is 603196931.

It is an interprime number because it is at equal distance from previous prime (139691303) and next prime (139691309).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (38), and also a Moran number because the ratio is a prime number: 3676087 = 139691306 / (1 + 3 + 9 + 6 + 9 + 1 + 3 + 0 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 139691306.

It is not an unprimeable number, because it can be changed into a prime (139691303) 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 3 ways as a sum of consecutive naturals, for example, 1838006 + ... + 1838081.

It is an arithmetic number, because the mean of its divisors is an integer number (27570660).

Almost surely, 2^139691306 is an apocalyptic number.

139691306 is a deficient number, since it is larger than the sum of its proper divisors (80873974).

139691306 is a wasteful number, since it uses less digits than its factorization.

139691306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3676108.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 139691306 is about 11819.1076651328. The cubic root of 139691306 is about 518.8674884418.

The spelling of 139691306 in words is "one hundred thirty-nine million, six hundred ninety-one thousand, three hundred six".