442281213 has 24 divisors (see below), whose sum is σ = 698505600. Its totient is φ = 267442560.

The previous prime is 442281193. The next prime is 442281269. The reversal of 442281213 is 312182244.

442281213 is a `hidden beast` number, since 442 + 2 + 8 + 1 + 213 = 666.

It is not a de Polignac number, because 442281213 - 2⁶ = 442281149 is a prime.

It is a super-2 number, since 2×442281213² = 391225342745502738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442281713) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41013 + ... + 50661.

It is an arithmetic number, because the mean of its divisors is an integer number (29104400).

Almost surely, 2^442281213 is an apocalyptic number.

It is an amenable number.

442281213 is a deficient number, since it is larger than the sum of its proper divisors (256224387).

442281213 is a wasteful number, since it uses less digits than its factorization.

442281213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10129 (or 10126 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 442281213 is about 21030.4829473790. The cubic root of 442281213 is about 761.9026732081.

The spelling of 442281213 in words is "four hundred forty-two million, two hundred eighty-one thousand, two hundred thirteen".