42644297 has 4 divisors (see below), whose sum is σ = 44114820. Its totient is φ = 41173776.

The previous prime is 42644293. The next prime is 42644333. The reversal of 42644297 is 79244624.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13278736 + 29365561 = 3644^2 + 5419^2 .

It is a cyclic number.

It is not a de Polignac number, because 42644297 - 2² = 42644293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42644297.

It is not an unprimeable number, because it can be changed into a prime (42644293) 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, 735218 + ... + 735275.

It is an arithmetic number, because the mean of its divisors is an integer number (11028705).

Almost surely, 2^42644297 is an apocalyptic number.

It is an amenable number.

42644297 is a deficient number, since it is larger than the sum of its proper divisors (1470523).

42644297 is a wasteful number, since it uses less digits than its factorization.

42644297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470522.

The product of its digits is 96768, while the sum is 38.

The square root of 42644297 is about 6530.2601020174. The cubic root of 42644297 is about 349.3711073946.

The spelling of 42644297 in words is "forty-two million, six hundred forty-four thousand, two hundred ninety-seven".