442530621 has 80 divisors (see below), whose sum is σ = 768398400. Its totient is φ = 251361792.

The previous prime is 442530617. The next prime is 442530623. The reversal of 442530621 is 126035244.

442530621 is a `hidden beast` number, since 4 + 4 + 2 + 5 + 30 + 621 = 666.

It is not a de Polignac number, because 442530621 - 2² = 442530617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442530623) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1055950 + ... + 1056368.

It is an arithmetic number, because the mean of its divisors is an integer number (9604980).

Almost surely, 2^442530621 is an apocalyptic number.

It is an amenable number.

442530621 is a deficient number, since it is larger than the sum of its proper divisors (325867779).

442530621 is a wasteful number, since it uses less digits than its factorization.

442530621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520 (or 511 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 442530621 is about 21036.4117900368. The cubic root of 442530621 is about 762.0458618314.

Adding to 442530621 its reverse (126035244), we get a palindrome (568565865).

The spelling of 442530621 in words is "four hundred forty-two million, five hundred thirty thousand, six hundred twenty-one".