442121237 has 2 divisors, whose sum is σ = 442121238. Its totient is φ = 442121236.

The previous prime is 442121233. The next prime is 442121257. The reversal of 442121237 is 732121244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 442092676 + 28561 = 21026^2 + 169^2 .

It is a cyclic number.

It is not a de Polignac number, because 442121237 - 2² = 442121233 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442121233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221060618 + 221060619.

It is an arithmetic number, because the mean of its divisors is an integer number (221060619).

Almost surely, 2^442121237 is an apocalyptic number.

It is an amenable number.

442121237 is a deficient number, since it is larger than the sum of its proper divisors (1).

442121237 is an equidigital number, since it uses as much as digits as its factorization.

442121237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 26.

The square root of 442121237 is about 21026.6791719472. The cubic root of 442121237 is about 761.8108004078.

The spelling of 442121237 in words is "four hundred forty-two million, one hundred twenty-one thousand, two hundred thirty-seven".