139426321 has 4 divisors (see below), whose sum is σ = 141390144. Its totient is φ = 137462500.

The previous prime is 139426319. The next prime is 139426327. The reversal of 139426321 is 123624931.

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 not a de Polignac number, because 139426321 - 2¹ = 139426319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139426327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 981805 + ... + 981946.

It is an arithmetic number, because the mean of its divisors is an integer number (35347536).

Almost surely, 2^139426321 is an apocalyptic number.

It is an amenable number.

139426321 is a deficient number, since it is larger than the sum of its proper divisors (1963823).

139426321 is an equidigital number, since it uses as much as digits as its factorization.

139426321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1963822.

The product of its digits is 7776, while the sum is 31.

The square root of 139426321 is about 11807.8923182759. The cubic root of 139426321 is about 518.5391952099.

The spelling of 139426321 in words is "one hundred thirty-nine million, four hundred twenty-six thousand, three hundred twenty-one".