139967999 has 4 divisors (see below), whose sum is σ = 140095320. Its totient is φ = 139840680.

The previous prime is 139967983. The next prime is 139968011. The reversal of 139967999 is 999769931.

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 139967999 - 2⁴ = 139967983 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 (139967939) 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, 61997 + ... + 64214.

It is an arithmetic number, because the mean of its divisors is an integer number (35023830).

Almost surely, 2^139967999 is an apocalyptic number.

139967999 is a deficient number, since it is larger than the sum of its proper divisors (127321).

139967999 is a wasteful number, since it uses less digits than its factorization.

139967999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127320.

The product of its digits is 7440174, while the sum is 62.

The square root of 139967999 is about 11830.8071998490. The cubic root of 139967999 is about 519.2098440742.

The spelling of 139967999 in words is "one hundred thirty-nine million, nine hundred sixty-seven thousand, nine hundred ninety-nine".