42644671 has 2 divisors, whose sum is σ = 42644672. Its totient is φ = 42644670.

The previous prime is 42644663. The next prime is 42644689. The reversal of 42644671 is 17644624.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42644671 - 2³ = 42644663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42644611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21322335 + 21322336.

It is an arithmetic number, because the mean of its divisors is an integer number (21322336).

Almost surely, 2^42644671 is an apocalyptic number.

42644671 is a deficient number, since it is larger than the sum of its proper divisors (1).

42644671 is an equidigital number, since it uses as much as digits as its factorization.

42644671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 34.

The square root of 42644671 is about 6530.2887378737. The cubic root of 42644671 is about 349.3721287458.

The spelling of 42644671 in words is "forty-two million, six hundred forty-four thousand, six hundred seventy-one".