442989407 has 16 divisors (see below), whose sum is σ = 533153280. Its totient is φ = 359849952.

The previous prime is 442989403. The next prime is 442989439. The reversal of 442989407 is 704989244.

It is not a de Polignac number, because 442989407 - 2² = 442989403 is a prime.

It is a super-2 number, since 2×442989407² = 392479229428423298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442989403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4928 + ... + 30170.

It is an arithmetic number, because the mean of its divisors is an integer number (33322080).

Almost surely, 2^442989407 is an apocalyptic number.

442989407 is a deficient number, since it is larger than the sum of its proper divisors (90163873).

442989407 is a wasteful number, since it uses less digits than its factorization.

442989407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25382.

The product of its (nonzero) digits is 580608, while the sum is 47.

The square root of 442989407 is about 21047.3135340356. The cubic root of 442989407 is about 762.3091168517.

The spelling of 442989407 in words is "four hundred forty-two million, nine hundred eighty-nine thousand, four hundred seven".