139075447 has 4 divisors (see below), whose sum is σ = 158943376. Its totient is φ = 119207520.

The previous prime is 139075427. The next prime is 139075463. The reversal of 139075447 is 744570931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 744570931 = 13 ⋅57274687.

It is a cyclic number.

It is not a de Polignac number, because 139075447 - 2²⁷ = 4857719 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 (139075427) 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, 9933954 + ... + 9933967.

It is an arithmetic number, because the mean of its divisors is an integer number (39735844).

Almost surely, 2^139075447 is an apocalyptic number.

139075447 is a deficient number, since it is larger than the sum of its proper divisors (19867929).

139075447 is an equidigital number, since it uses as much as digits as its factorization.

139075447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19867928.

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 139075447 is about 11793.0253539963. The cubic root of 139075447 is about 518.1038523557.

The spelling of 139075447 in words is "one hundred thirty-nine million, seventy-five thousand, four hundred forty-seven".