442520399 has 4 divisors (see below), whose sum is σ = 444992760. Its totient is φ = 440048040.

The previous prime is 442520389. The next prime is 442520401. The reversal of 442520399 is 993025244.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 442520399 - 2¹⁶ = 442454863 is a prime.

It is a super-2 number, since 2×442520399² = 391648607062238402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442520389) 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, 1235912 + ... + 1236269.

It is an arithmetic number, because the mean of its divisors is an integer number (111248190).

Almost surely, 2^442520399 is an apocalyptic number.

442520399 is a deficient number, since it is larger than the sum of its proper divisors (2472361).

442520399 is a wasteful number, since it uses less digits than its factorization.

442520399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2472360.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 442520399 is about 21036.1688289479. The cubic root of 442520399 is about 762.0399942956.

The spelling of 442520399 in words is "four hundred forty-two million, five hundred twenty thousand, three hundred ninety-nine".