139395643 has 4 divisors (see below), whose sum is σ = 139419720. Its totient is φ = 139371568.

The previous prime is 139395593. The next prime is 139395653. The reversal of 139395643 is 346593931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346593931 = 17839 ⋅19429.

It is a cyclic number.

It is not a de Polignac number, because 139395643 - 2⁹ = 139395131 is a prime.

It is a super-2 number, since 2×139395643² = 38862290574766898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139395643.

It is not an unprimeable number, because it can be changed into a prime (139395653) 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, 2496 + ... + 16882.

It is an arithmetic number, because the mean of its divisors is an integer number (34854930).

Almost surely, 2^139395643 is an apocalyptic number.

139395643 is a deficient number, since it is larger than the sum of its proper divisors (24077).

139395643 is an equidigital number, since it uses as much as digits as its factorization.

139395643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24076.

The product of its digits is 262440, while the sum is 43.

The square root of 139395643 is about 11806.5932004114. The cubic root of 139395643 is about 518.5011609942.

The spelling of 139395643 in words is "one hundred thirty-nine million, three hundred ninety-five thousand, six hundred forty-three".