139447799 has 4 divisors (see below), whose sum is σ = 139681200. Its totient is φ = 139214400.

The previous prime is 139447793. The next prime is 139447801. The reversal of 139447799 is 997744931.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139447799 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139447799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139447793) 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, 115802 + ... + 116999.

It is an arithmetic number, because the mean of its divisors is an integer number (34920300).

Almost surely, 2^139447799 is an apocalyptic number.

139447799 is a deficient number, since it is larger than the sum of its proper divisors (233401).

139447799 is an equidigital number, since it uses as much as digits as its factorization.

139447799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233400.

The product of its digits is 1714608, while the sum is 53.

The square root of 139447799 is about 11808.8017597045. The cubic root of 139447799 is about 518.5658200560.

The spelling of 139447799 in words is "one hundred thirty-nine million, four hundred forty-seven thousand, seven hundred ninety-nine".