442446421 has 4 divisors (see below), whose sum is σ = 443130912. Its totient is φ = 441761932.

The previous prime is 442446409. The next prime is 442446427. The reversal of 442446421 is 124644244.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 442446421 - 2¹³ = 442438229 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 (442446427) 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, 341275 + ... + 342568.

It is an arithmetic number, because the mean of its divisors is an integer number (110782728).

Almost surely, 2^442446421 is an apocalyptic number.

It is an amenable number.

442446421 is a deficient number, since it is larger than the sum of its proper divisors (684491).

442446421 is an equidigital number, since it uses as much as digits as its factorization.

442446421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 684490.

The product of its digits is 24576, while the sum is 31.

The square root of 442446421 is about 21034.4104029564. The cubic root of 442446421 is about 761.9975274500.

The spelling of 442446421 in words is "four hundred forty-two million, four hundred forty-six thousand, four hundred twenty-one".