442978637 has 8 divisors (see below), whose sum is σ = 454365240. Its totient is φ = 431619840.

The previous prime is 442978631. The next prime is 442978663. The reversal of 442978637 is 736879244.

It can be written as a sum of positive squares in 4 ways, for example, as 19483396 + 423495241 = 4414^2 + 20579^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 442978637 - 2⁴ = 442978621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442978631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27473 + ... + 40505.

It is an arithmetic number, because the mean of its divisors is an integer number (56795655).

Almost surely, 2^442978637 is an apocalyptic number.

It is an amenable number.

442978637 is a deficient number, since it is larger than the sum of its proper divisors (11386603).

442978637 is a wasteful number, since it uses less digits than its factorization.

442978637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13903.

The product of its digits is 2032128, while the sum is 50.

The square root of 442978637 is about 21047.0576803505. The cubic root of 442978637 is about 762.3029390248.

The spelling of 442978637 in words is "four hundred forty-two million, nine hundred seventy-eight thousand, six hundred thirty-seven".