42643623 has 16 divisors (see below), whose sum is σ = 62188416. Its totient is φ = 25777440.

The previous prime is 42643613. The next prime is 42643637. The reversal of 42643623 is 32634624.

It is a happy number.

It is not a de Polignac number, because 42643623 - 2⁵ = 42643591 is a prime.

It is a super-2 number, since 2×42643623² = 3636957165132258, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42643613) 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, 13161 + ... + 16077.

It is an arithmetic number, because the mean of its divisors is an integer number (3886776).

Almost surely, 2^42643623 is an apocalyptic number.

42643623 is a deficient number, since it is larger than the sum of its proper divisors (19544793).

42643623 is a wasteful number, since it uses less digits than its factorization.

42643623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3374.

The product of its digits is 20736, while the sum is 30.

The square root of 42643623 is about 6530.2084959058. The cubic root of 42643623 is about 349.3692667627.

It can be divided in two parts, 4264 and 3623, that added together give a palindrome (7887).

The spelling of 42643623 in words is "forty-two million, six hundred forty-three thousand, six hundred twenty-three".