42744639 has 16 divisors (see below), whose sum is σ = 66029312. Its totient is φ = 24090048.

The previous prime is 42744607. The next prime is 42744641. The reversal of 42744639 is 93644724.

It is not a de Polignac number, because 42744639 - 2⁵ = 42744607 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42744597 and 42744606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42744439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12409 + ... + 15474.

It is an arithmetic number, because the mean of its divisors is an integer number (4126832).

Almost surely, 2^42744639 is an apocalyptic number.

42744639 is a deficient number, since it is larger than the sum of its proper divisors (23284673).

42744639 is a wasteful number, since it uses less digits than its factorization.

42744639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27966.

The product of its digits is 145152, while the sum is 39.

The square root of 42744639 is about 6537.9384365410. The cubic root of 42744639 is about 349.6449160706.

The spelling of 42744639 in words is "forty-two million, seven hundred forty-four thousand, six hundred thirty-nine".