139224643 has 4 divisors (see below), whose sum is σ = 142620408. Its totient is φ = 135828880.

The previous prime is 139224607. The next prime is 139224649. The reversal of 139224643 is 346422931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346422931 = 677 ⋅511703.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139224643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139224599 and 139224608.

It is not an unprimeable number, because it can be changed into a prime (139224649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1697821 + ... + 1697902.

It is an arithmetic number, because the mean of its divisors is an integer number (35655102).

Almost surely, 2^139224643 is an apocalyptic number.

139224643 is a deficient number, since it is larger than the sum of its proper divisors (3395765).

139224643 is an equidigital number, since it uses as much as digits as its factorization.

139224643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3395764.

The product of its digits is 31104, while the sum is 34.

The square root of 139224643 is about 11799.3492617178. The cubic root of 139224643 is about 518.2890549421.

The spelling of 139224643 in words is "one hundred thirty-nine million, two hundred twenty-four thousand, six hundred forty-three".