139712399 has 8 divisors (see below), whose sum is σ = 142998912. Its totient is φ = 136450080.

The previous prime is 139712317. The next prime is 139712411. The reversal of 139712399 is 993217931.

It is a Cunningham number, because it is equal to 11820²-1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139712399 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 (139712099) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5909 + ... + 17729.

It is an arithmetic number, because the mean of its divisors is an integer number (17874864).

Almost surely, 2^139712399 is an apocalyptic number.

139712399 is a deficient number, since it is larger than the sum of its proper divisors (3286513).

139712399 is a wasteful number, since it uses less digits than its factorization.

139712399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12097.

The product of its digits is 91854, while the sum is 44.

The square root of 139712399 is about 11819.9999576988. Note that the first 4 decimals coincide. The cubic root of 139712399 is about 518.8936029782.

The spelling of 139712399 in words is "one hundred thirty-nine million, seven hundred twelve thousand, three hundred ninety-nine".