391020 has 96 divisors (see below), whose sum is σ = 1344000. Its totient is φ = 84672.

The previous prime is 391019. The next prime is 391021. The reversal of 391020 is 20193.

391020 = 11² + 12² + ... + 105².

391020 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (391019) and next prime (391021).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391021) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 20571 + ... + 20589.

It is an arithmetic number, because the mean of its divisors is an integer number (14000).

2³⁹¹⁰²⁰ is an apocalyptic number.

391020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (672000).

391020 is an abundant number, since it is smaller than the sum of its proper divisors (952980).

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

391020 is a wasteful number, since it uses less digits than its factorization.

391020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52 (or 36 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 391020 is about 625.3159201556. The cubic root of 391020 is about 73.1250748776.

The spelling of 391020 in words is "three hundred ninety-one thousand, twenty".