442978481 has 4 divisors (see below), whose sum is σ = 483249264. Its totient is φ = 402707700.

The previous prime is 442978463. The next prime is 442978513. The reversal of 442978481 is 184879244.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442978481 is a prime.

It is a super-2 number, since 2×442978481² = 392459869258134722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442978421) 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, 20135375 + ... + 20135396.

It is an arithmetic number, because the mean of its divisors is an integer number (120812316).

Almost surely, 2^442978481 is an apocalyptic number.

It is an amenable number.

442978481 is a deficient number, since it is larger than the sum of its proper divisors (40270783).

442978481 is a wasteful number, since it uses less digits than its factorization.

442978481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40270782.

The product of its digits is 516096, while the sum is 47.

The square root of 442978481 is about 21047.0539743690. The cubic root of 442978481 is about 762.3028495402.

The spelling of 442978481 in words is "four hundred forty-two million, nine hundred seventy-eight thousand, four hundred eighty-one".