139681493 has 16 divisors (see below), whose sum is σ = 162379776. Its totient is φ = 117687600.

The previous prime is 139681489. The next prime is 139681519. The reversal of 139681493 is 394186931.

It is a cyclic number.

It is not a de Polignac number, because 139681493 - 2² = 139681489 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 (139681433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108230 + ... + 109512.

It is an arithmetic number, because the mean of its divisors is an integer number (10148736).

Almost surely, 2^139681493 is an apocalyptic number.

It is an amenable number.

139681493 is a deficient number, since it is larger than the sum of its proper divisors (22698283).

139681493 is a wasteful number, since it uses less digits than its factorization.

139681493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544.

The product of its digits is 139968, while the sum is 44.

The square root of 139681493 is about 11818.6925249792. The cubic root of 139681493 is about 518.8553383993.

The spelling of 139681493 in words is "one hundred thirty-nine million, six hundred eighty-one thousand, four hundred ninety-three".