442999857 has 4 divisors (see below), whose sum is σ = 590666480. Its totient is φ = 295333236.

The previous prime is 442999819. The next prime is 442999859. The reversal of 442999857 is 758999244.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 442999857 - 2¹⁰ = 442998833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 442999797 and 442999806.

It is not an unprimeable number, because it can be changed into a prime (442999859) 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, 73833307 + ... + 73833312.

It is an arithmetic number, because the mean of its divisors is an integer number (147666620).

Almost surely, 2^442999857 is an apocalyptic number.

It is an amenable number.

442999857 is a deficient number, since it is larger than the sum of its proper divisors (147666623).

442999857 is a wasteful number, since it uses less digits than its factorization.

442999857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147666622.

The product of its digits is 6531840, while the sum is 57.

The square root of 442999857 is about 21047.5617827814. The cubic root of 442999857 is about 762.3151110264.

The spelling of 442999857 in words is "four hundred forty-two million, nine hundred ninety-nine thousand, eight hundred fifty-seven".