139681738 has 16 divisors (see below), whose sum is σ = 240712704. Its totient is φ = 59549040.

The previous prime is 139681681. The next prime is 139681739. The reversal of 139681738 is 837186931.

139681738 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (139681739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23445 + ... + 28792.

It is an arithmetic number, because the mean of its divisors is an integer number (15044544).

Almost surely, 2^139681738 is an apocalyptic number.

139681738 is a deficient number, since it is larger than the sum of its proper divisors (101030966).

139681738 is a wasteful number, since it uses less digits than its factorization.

139681738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52437.

The product of its digits is 217728, while the sum is 46.

The square root of 139681738 is about 11818.7028899114. The cubic root of 139681738 is about 518.8556417549.

The spelling of 139681738 in words is "one hundred thirty-nine million, six hundred eighty-one thousand, seven hundred thirty-eight".