442679391 has 64 divisors (see below), whose sum is σ = 829440000. Its totient is φ = 226648800.

The previous prime is 442679389. The next prime is 442679401. The reversal of 442679391 is 193976244.

It is a happy number.

It is not a de Polignac number, because 442679391 - 2¹ = 442679389 is a prime.

It is a super-2 number, since 2×442679391² = 391930086432261762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442679381) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 146110 + ... + 149108.

It is an arithmetic number, because the mean of its divisors is an integer number (12960000).

Almost surely, 2^442679391 is an apocalyptic number.

442679391 is a deficient number, since it is larger than the sum of its proper divisors (386760609).

442679391 is a wasteful number, since it uses less digits than its factorization.

442679391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3097 (or 3091 counting only the distinct ones).

The product of its digits is 326592, while the sum is 45.

The square root of 442679391 is about 21039.9475046874. The cubic root of 442679391 is about 762.1312471552.

The spelling of 442679391 in words is "four hundred forty-two million, six hundred seventy-nine thousand, three hundred ninety-one".