139421306 has 4 divisors (see below), whose sum is σ = 209131962. Its totient is φ = 69710652.

The previous prime is 139421273. The next prime is 139421311. The reversal of 139421306 is 603124931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 120802081 + 18619225 = 10991^2 + 4315^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34855325 + ... + 34855328.

Almost surely, 2^139421306 is an apocalyptic number.

139421306 is a deficient number, since it is larger than the sum of its proper divisors (69710656).

139421306 is an equidigital number, since it uses as much as digits as its factorization.

139421306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69710655.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 139421306 is about 11807.6799584000. The cubic root of 139421306 is about 518.5329780547.

The spelling of 139421306 in words is "one hundred thirty-nine million, four hundred twenty-one thousand, three hundred six".