393842 has 8 divisors (see below), whose sum is σ = 594432. Its totient is φ = 195700.

The previous prime is 393797. The next prime is 393847. The reversal of 393842 is 248393.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×393842² = 310223041928, which contains 22 as substring.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (393847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134 + ... + 897.

It is an arithmetic number, because the mean of its divisors is an integer number (74304).

2³⁹³⁸⁴² is an apocalyptic number.

393842 is a deficient number, since it is larger than the sum of its proper divisors (200590).

393842 is a wasteful number, since it uses less digits than its factorization.

393842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224.

The product of its digits is 5184, while the sum is 29.

The square root of 393842 is about 627.5683229737. The cubic root of 393842 is about 73.3005684668.

The spelling of 393842 in words is "three hundred ninety-three thousand, eight hundred forty-two".