442872621 has 12 divisors (see below), whose sum is σ = 639898272. Its totient is φ = 295159176.

The previous prime is 442872583. The next prime is 442872623. The reversal of 442872621 is 126278244.

442872621 is a `hidden beast` number, since 4 + 4 + 28 + 7 + 2 + 621 = 666.

It is not a de Polignac number, because 442872621 - 2⁶ = 442872557 is a prime.

It is a super-2 number, since 2×442872621² = 392272316862819282, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442872623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39750 + ... + 49656.

It is an arithmetic number, because the mean of its divisors is an integer number (53324856).

Almost surely, 2^442872621 is an apocalyptic number.

It is an amenable number.

442872621 is a deficient number, since it is larger than the sum of its proper divisors (197025651).

442872621 is a wasteful number, since it uses less digits than its factorization.

442872621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14880 (or 14877 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 442872621 is about 21044.5389828335. The cubic root of 442872621 is about 762.2421213768.

The spelling of 442872621 in words is "four hundred forty-two million, eight hundred seventy-two thousand, six hundred twenty-one".