391143 has 8 divisors (see below), whose sum is σ = 524656. Its totient is φ = 259200.

The previous prime is 391133. The next prime is 391151. The reversal of 391143 is 341193.

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

It is not a de Polignac number, because 391143 - 2¹⁰ = 390119 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 453 + ... + 993.

It is an arithmetic number, because the mean of its divisors is an integer number (65582).

2³⁹¹¹⁴³ is an apocalyptic number.

391143 is a deficient number, since it is larger than the sum of its proper divisors (133513).

391143 is a wasteful number, since it uses less digits than its factorization.

391143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785.

The product of its digits is 324, while the sum is 21.

The square root of 391143 is about 625.4142627091. The cubic root of 391143 is about 73.1327415283.

The spelling of 391143 in words is "three hundred ninety-one thousand, one hundred forty-three".