139351642 has 4 divisors (see below), whose sum is σ = 209027466. Its totient is φ = 69675820.

The previous prime is 139351637. The next prime is 139351651. The reversal of 139351642 is 246153931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 246153931 = 17 ⋅14479643.

It can be written as a sum of positive squares in only one way, i.e., 75846681 + 63504961 = 8709^2 + 7969^2 .

It is a junction number, because it is equal to n+sod(n) for n = 139351598 and 139351607.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 34837909 + ... + 34837912.

Almost surely, 2^139351642 is an apocalyptic number.

139351642 is a deficient number, since it is larger than the sum of its proper divisors (69675824).

139351642 is an equidigital number, since it uses as much as digits as its factorization.

139351642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69675823.

The product of its digits is 19440, while the sum is 34.

The square root of 139351642 is about 11804.7296453583. The cubic root of 139351642 is about 518.4465993402.

It can be divided in two parts, 1393 and 51642, that added together give a palindrome (53035).

The spelling of 139351642 in words is "one hundred thirty-nine million, three hundred fifty-one thousand, six hundred forty-two".