139879699 has 4 divisors (see below), whose sum is σ = 139948936. Its totient is φ = 139810464.

The previous prime is 139879697. The next prime is 139879711. The reversal of 139879699 is 996978931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 996978931 = 13 ⋅76690687.

It is a cyclic number.

It is not a de Polignac number, because 139879699 - 2¹ = 139879697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139879693) 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, 31494 + ... + 35659.

It is an arithmetic number, because the mean of its divisors is an integer number (34987234).

Almost surely, 2^139879699 is an apocalyptic number.

139879699 is a deficient number, since it is larger than the sum of its proper divisors (69237).

139879699 is an equidigital number, since it uses as much as digits as its factorization.

139879699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69236.

The product of its digits is 6613488, while the sum is 61.

The square root of 139879699 is about 11827.0748285449. The cubic root of 139879699 is about 519.1006384611.

The spelling of 139879699 in words is "one hundred thirty-nine million, eight hundred seventy-nine thousand, six hundred ninety-nine".