42344639 has 4 divisors (see below), whose sum is σ = 42755856. Its totient is φ = 41933424.

The previous prime is 42344593. The next prime is 42344651. The reversal of 42344639 is 93644324.

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 42344639 - 2⁸ = 42344383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42344599 and 42344608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42344699) 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, 205454 + ... + 205659.

It is an arithmetic number, because the mean of its divisors is an integer number (10688964).

Almost surely, 2^42344639 is an apocalyptic number.

42344639 is a deficient number, since it is larger than the sum of its proper divisors (411217).

42344639 is a wasteful number, since it uses less digits than its factorization.

42344639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411216.

The product of its digits is 62208, while the sum is 35.

The square root of 42344639 is about 6507.2758509226. The cubic root of 42344639 is about 348.5508489869.

The spelling of 42344639 in words is "forty-two million, three hundred forty-four thousand, six hundred thirty-nine".