139651789 has 4 divisors (see below), whose sum is σ = 140066524. Its totient is φ = 139237056.

The previous prime is 139651783. The next prime is 139651793. The reversal of 139651789 is 987156931.

139651789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32114889 + 107536900 = 5667^2 + 10370^2 .

It is a cyclic number.

It is not a de Polignac number, because 139651789 - 2¹⁹ = 139127501 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 (139651783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206862 + ... + 207535.

It is an arithmetic number, because the mean of its divisors is an integer number (35016631).

Almost surely, 2^139651789 is an apocalyptic number.

It is an amenable number.

139651789 is a deficient number, since it is larger than the sum of its proper divisors (414735).

139651789 is an equidigital number, since it uses as much as digits as its factorization.

139651789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414734.

The product of its digits is 408240, while the sum is 49.

The square root of 139651789 is about 11817.4358047759. The cubic root of 139651789 is about 518.8185566915.

The spelling of 139651789 in words is "one hundred thirty-nine million, six hundred fifty-one thousand, seven hundred eighty-nine".