442378397 has 4 divisors (see below), whose sum is σ = 453168156. Its totient is φ = 431588640.

The previous prime is 442378381. The next prime is 442378457. The reversal of 442378397 is 793873244.

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

It can be written as a sum of positive squares in 2 ways, for example, as 101828281 + 340550116 = 10091^2 + 18454^2 .

It is a cyclic number.

It is not a de Polignac number, because 442378397 - 2⁴ = 442378381 is a prime.

It is a super-4 number, since 4×442378397⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442378997) 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, 5394818 + ... + 5394899.

It is an arithmetic number, because the mean of its divisors is an integer number (113292039).

Almost surely, 2^442378397 is an apocalyptic number.

It is an amenable number.

442378397 is a deficient number, since it is larger than the sum of its proper divisors (10789759).

442378397 is a wasteful number, since it uses less digits than its factorization.

442378397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10789758.

The product of its digits is 1016064, while the sum is 47.

The square root of 442378397 is about 21032.7933713047. The cubic root of 442378397 is about 761.9584743022.

The spelling of 442378397 in words is "four hundred forty-two million, three hundred seventy-eight thousand, three hundred ninety-seven".