42644399 has 4 divisors (see below), whose sum is σ = 48736464. Its totient is φ = 36552336.

The previous prime is 42644389. The next prime is 42644411. The reversal of 42644399 is 99344624.

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 42644399 - 2²⁰ = 41595823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42644389) 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, 3046022 + ... + 3046035.

It is an arithmetic number, because the mean of its divisors is an integer number (12184116).

Almost surely, 2^42644399 is an apocalyptic number.

42644399 is a deficient number, since it is larger than the sum of its proper divisors (6092065).

42644399 is an equidigital number, since it uses as much as digits as its factorization.

42644399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6092064.

The product of its digits is 186624, while the sum is 41.

The square root of 42644399 is about 6530.2679118088. The cubic root of 42644399 is about 349.3713859455.

The spelling of 42644399 in words is "forty-two million, six hundred forty-four thousand, three hundred ninety-nine".