139306919 has 4 divisors (see below), whose sum is σ = 142270944. Its totient is φ = 136342896.

The previous prime is 139306913. The next prime is 139306927. The reversal of 139306919 is 919603931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 919603931 = 28403 ⋅32377.

It is a cyclic number.

It is not a de Polignac number, because 139306919 - 2⁸ = 139306663 is a prime.

It is a super-2 number, since 2×139306919² = 38812835362545122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139306913) 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, 1481942 + ... + 1482035.

It is an arithmetic number, because the mean of its divisors is an integer number (35567736).

Almost surely, 2^139306919 is an apocalyptic number.

139306919 is a deficient number, since it is larger than the sum of its proper divisors (2964025).

139306919 is an equidigital number, since it uses as much as digits as its factorization.

139306919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2964024.

The product of its (nonzero) digits is 39366, while the sum is 41.

The square root of 139306919 is about 11802.8352102366. The cubic root of 139306919 is about 518.3911306285.

The spelling of 139306919 in words is "one hundred thirty-nine million, three hundred six thousand, nine hundred nineteen".