139978199 has 4 divisors (see below), whose sum is σ = 140917800. Its totient is φ = 139038600.

The previous prime is 139978193. The next prime is 139978211. The reversal of 139978199 is 991879931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 991879931 = 7 ⋅141697133.

It is a cyclic number.

It is not a de Polignac number, because 139978199 - 2¹² = 139974103 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 (139978193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469577 + ... + 469874.

It is an arithmetic number, because the mean of its divisors is an integer number (35229450).

Almost surely, 2^139978199 is an apocalyptic number.

139978199 is a deficient number, since it is larger than the sum of its proper divisors (939601).

139978199 is an equidigital number, since it uses as much as digits as its factorization.

139978199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939600.

The product of its digits is 1102248, while the sum is 56.

The square root of 139978199 is about 11831.2382699361. The cubic root of 139978199 is about 519.2224560326. Note that the first 3 decimals are identical.

The spelling of 139978199 in words is "one hundred thirty-nine million, nine hundred seventy-eight thousand, one hundred ninety-nine".