139861273 has 4 divisors (see below), whose sum is σ = 140019840. Its totient is φ = 139702708.

The previous prime is 139861219. The next prime is 139861289. The reversal of 139861273 is 372168931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139861273 is a prime.

It is a super-2 number, since 2×139861273² = 39122351370361058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139864273) 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, 77953 + ... + 79726.

It is an arithmetic number, because the mean of its divisors is an integer number (35004960).

Almost surely, 2^139861273 is an apocalyptic number.

It is an amenable number.

139861273 is a deficient number, since it is larger than the sum of its proper divisors (158567).

139861273 is an equidigital number, since it uses as much as digits as its factorization.

139861273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158566.

The product of its digits is 54432, while the sum is 40.

The square root of 139861273 is about 11826.2958275193. The cubic root of 139861273 is about 519.0778441875.

The spelling of 139861273 in words is "one hundred thirty-nine million, eight hundred sixty-one thousand, two hundred seventy-three".