139427999 has 4 divisors (see below), whose sum is σ = 147629664. Its totient is φ = 131226336.

The previous prime is 139427983. The next prime is 139428007. The reversal of 139427999 is 999724931.

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

It is a cyclic number.

It is not a de Polignac number, because 139427999 - 2⁴ = 139427983 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 139427999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139427399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4100807 + ... + 4100840.

It is an arithmetic number, because the mean of its divisors is an integer number (36907416).

Almost surely, 2^139427999 is an apocalyptic number.

139427999 is a deficient number, since it is larger than the sum of its proper divisors (8201665).

139427999 is an equidigital number, since it uses as much as digits as its factorization.

139427999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8201664.

The product of its digits is 1102248, while the sum is 53.

The square root of 139427999 is about 11807.9633722332. The cubic root of 139427999 is about 518.5412754132.

The spelling of 139427999 in words is "one hundred thirty-nine million, four hundred twenty-seven thousand, nine hundred ninety-nine".