139642943 has 4 divisors (see below), whose sum is σ = 152337768. Its totient is φ = 126948120.

The previous prime is 139642939. The next prime is 139642957. The reversal of 139642943 is 349246931.

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

It is a cyclic number.

It is not a de Polignac number, because 139642943 - 2² = 139642939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139642943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139642963) 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, 6347396 + ... + 6347417.

It is an arithmetic number, because the mean of its divisors is an integer number (38084442).

Almost surely, 2^139642943 is an apocalyptic number.

139642943 is a deficient number, since it is larger than the sum of its proper divisors (12694825).

139642943 is a wasteful number, since it uses less digits than its factorization.

139642943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12694824.

The product of its digits is 139968, while the sum is 41.

The square root of 139642943 is about 11817.0615213766. The cubic root of 139642943 is about 518.8076019067.

The spelling of 139642943 in words is "one hundred thirty-nine million, six hundred forty-two thousand, nine hundred forty-three".