442406621 has 8 divisors (see below), whose sum is σ = 470494080. Its totient is φ = 414799488.

The previous prime is 442406617. The next prime is 442406641. The reversal of 442406621 is 126604244.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 442406621 - 2² = 442406617 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 (442406641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118181 + ... + 121866.

It is an arithmetic number, because the mean of its divisors is an integer number (58811760).

Almost surely, 2^442406621 is an apocalyptic number.

It is an amenable number.

442406621 is a deficient number, since it is larger than the sum of its proper divisors (28087459).

442406621 is a wasteful number, since it uses less digits than its factorization.

442406621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240163.

The product of its (nonzero) digits is 9216, while the sum is 29.

The square root of 442406621 is about 21033.4643128516. The cubic root of 442406621 is about 761.9746784227.

The spelling of 442406621 in words is "four hundred forty-two million, four hundred six thousand, six hundred twenty-one".