391438 has 8 divisors (see below), whose sum is σ = 618120. Its totient is φ = 185400.

The previous prime is 391403. The next prime is 391441. The reversal of 391438 is 834193.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5113 + ... + 5188.

It is an arithmetic number, because the mean of its divisors is an integer number (77265).

2³⁹¹⁴³⁸ is an apocalyptic number.

391438 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

391438 is a deficient number, since it is larger than the sum of its proper divisors (226682).

391438 is a wasteful number, since it uses less digits than its factorization.

391438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10322.

The product of its digits is 2592, while the sum is 28.

The square root of 391438 is about 625.6500619356. The cubic root of 391438 is about 73.1511224761.

The spelling of 391438 in words is "three hundred ninety-one thousand, four hundred thirty-eight".