139384447 has 4 divisors (see below), whose sum is σ = 139838776. Its totient is φ = 138930120.

The previous prime is 139384433. The next prime is 139384471. The reversal of 139384447 is 744483931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 744483931 = 6113 ⋅121787.

It is a cyclic number.

It is not a de Polignac number, because 139384447 - 2⁷ = 139384319 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 (139484447) 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, 226704 + ... + 227317.

It is an arithmetic number, because the mean of its divisors is an integer number (34959694).

Almost surely, 2^139384447 is an apocalyptic number.

139384447 is a deficient number, since it is larger than the sum of its proper divisors (454329).

139384447 is an equidigital number, since it uses as much as digits as its factorization.

139384447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454328.

The product of its digits is 290304, while the sum is 43.

The square root of 139384447 is about 11806.1190490355. The cubic root of 139384447 is about 518.4872789381.

The spelling of 139384447 in words is "one hundred thirty-nine million, three hundred eighty-four thousand, four hundred forty-seven".