442340387 has 4 divisors (see below), whose sum is σ = 465621480. Its totient is φ = 419059296.

The previous prime is 442340369. The next prime is 442340411. The reversal of 442340387 is 783043244.

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 442340387 - 2¹⁰ = 442339363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442340687) 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, 11640518 + ... + 11640555.

It is an arithmetic number, because the mean of its divisors is an integer number (116405370).

Almost surely, 2^442340387 is an apocalyptic number.

442340387 is a deficient number, since it is larger than the sum of its proper divisors (23281093).

442340387 is a wasteful number, since it uses less digits than its factorization.

442340387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23281092.

The product of its (nonzero) digits is 64512, while the sum is 35.

The square root of 442340387 is about 21031.8897629291. The cubic root of 442340387 is about 761.9366506995.

The spelling of 442340387 in words is "four hundred forty-two million, three hundred forty thousand, three hundred eighty-seven".