42739643 has 4 divisors (see below), whose sum is σ = 42863160. Its totient is φ = 42616128.

The previous prime is 42739633. The next prime is 42739693. The reversal of 42739643 is 34693724.

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 42739643 - 2⁸ = 42739387 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42739597 and 42739606.

It is not an unprimeable number, because it can be changed into a prime (42739633) 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, 61238 + ... + 61931.

It is an arithmetic number, because the mean of its divisors is an integer number (10715790).

Almost surely, 2^42739643 is an apocalyptic number.

42739643 is a deficient number, since it is larger than the sum of its proper divisors (123517).

42739643 is a wasteful number, since it uses less digits than its factorization.

42739643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123516.

The product of its digits is 108864, while the sum is 38.

The square root of 42739643 is about 6537.5563477495. The cubic root of 42739643 is about 349.6312933559.

The spelling of 42739643 in words is "forty-two million, seven hundred thirty-nine thousand, six hundred forty-three".