442682921 has 2 divisors, whose sum is σ = 442682922. Its totient is φ = 442682920.

The previous prime is 442682887. The next prime is 442682951. The reversal of 442682921 is 129286244.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 277688896 + 164994025 = 16664^2 + 12845^2 .

It is a cyclic number.

It is not a de Polignac number, because 442682921 - 2²⁶ = 375574057 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (442682951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221341460 + 221341461.

It is an arithmetic number, because the mean of its divisors is an integer number (221341461).

Almost surely, 2^442682921 is an apocalyptic number.

It is an amenable number.

442682921 is a deficient number, since it is larger than the sum of its proper divisors (1).

442682921 is an equidigital number, since it uses as much as digits as its factorization.

442682921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 38.

The square root of 442682921 is about 21040.0313925621. The cubic root of 442682921 is about 762.1332729374.

The spelling of 442682921 in words is "four hundred forty-two million, six hundred eighty-two thousand, nine hundred twenty-one".