442213999 has 4 divisors (see below), whose sum is σ = 465488440. Its totient is φ = 418939560.

The previous prime is 442213991. The next prime is 442214009. The reversal of 442213999 is 999312244.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 442213999 - 2³ = 442213991 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 (442213991) 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, 11637192 + ... + 11637229.

It is an arithmetic number, because the mean of its divisors is an integer number (116372110).

Almost surely, 2^442213999 is an apocalyptic number.

442213999 is a deficient number, since it is larger than the sum of its proper divisors (23274441).

442213999 is a wasteful number, since it uses less digits than its factorization.

442213999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23274440.

The product of its digits is 139968, while the sum is 43.

The square root of 442213999 is about 21028.8848729551. The cubic root of 442213999 is about 761.8640755021.

The spelling of 442213999 in words is "four hundred forty-two million, two hundred thirteen thousand, nine hundred ninety-nine".