139347999 has 16 divisors (see below), whose sum is σ = 235933440. Its totient is φ = 79627320.

The previous prime is 139347991. The next prime is 139348003. The reversal of 139347999 is 999743931.

It is not a de Polignac number, because 139347999 - 2³ = 139347991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139347991) 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, 368457 + ... + 368834.

It is an arithmetic number, because the mean of its divisors is an integer number (14745840).

Almost surely, 2^139347999 is an apocalyptic number.

139347999 is a deficient number, since it is larger than the sum of its proper divisors (96585441).

139347999 is an equidigital number, since it uses as much as digits as its factorization.

139347999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737307 (or 737301 counting only the distinct ones).

The product of its digits is 1653372, while the sum is 54.

The square root of 139347999 is about 11804.5753417901. The cubic root of 139347999 is about 518.4420814712.

The spelling of 139347999 in words is "one hundred thirty-nine million, three hundred forty-seven thousand, nine hundred ninety-nine".