391420 has 12 divisors (see below), whose sum is σ = 822024. Its totient is φ = 156560.

The previous prime is 391403. The next prime is 391441. The reversal of 391420 is 24193.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9766 + ... + 9805.

It is an arithmetic number, because the mean of its divisors is an integer number (68502).

2³⁹¹⁴²⁰ is an apocalyptic number.

It is an amenable number.

391420 is an abundant number, since it is smaller than the sum of its proper divisors (430604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

391420 is a wasteful number, since it uses less digits than its factorization.

391420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19580 (or 19578 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 391420 is about 625.6356767321. The cubic root of 391420 is about 73.1500011914.

The spelling of 391420 in words is "three hundred ninety-one thousand, four hundred twenty".