139193819 has 4 divisors (see below), whose sum is σ = 139224096. Its totient is φ = 139163544.

The previous prime is 139193809. The next prime is 139193843. The reversal of 139193819 is 918391931.

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 139193819 - 2¹² = 139189723 is a prime.

It is a super-2 number, since 2×139193819² = 38749838495609522, which contains 22 as substring.

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 139193819.

It is not an unprimeable number, because it can be changed into a prime (139193809) 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, 6659 + ... + 17964.

It is an arithmetic number, because the mean of its divisors is an integer number (34806024).

Almost surely, 2^139193819 is an apocalyptic number.

139193819 is a deficient number, since it is larger than the sum of its proper divisors (30277).

139193819 is an equidigital number, since it uses as much as digits as its factorization.

139193819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30276.

The product of its digits is 52488, while the sum is 44.

The square root of 139193819 is about 11798.0430156870. The cubic root of 139193819 is about 518.2508028036.

The spelling of 139193819 in words is "one hundred thirty-nine million, one hundred ninety-three thousand, eight hundred nineteen".