391230 has 96 divisors (see below), whose sum is σ = 1257984. Its totient is φ = 85536.

The previous prime is 391219. The next prime is 391231. The reversal of 391230 is 32193.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391231) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16999 + ... + 17021.

It is an arithmetic number, because the mean of its divisors is an integer number (13104).

2³⁹¹²³⁰ is an apocalyptic number.

391230 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 391230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (628992).

391230 is an abundant number, since it is smaller than the sum of its proper divisors (866754).

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

391230 is a wasteful number, since it uses less digits than its factorization.

391230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

The square root of 391230 is about 625.4838127402. The cubic root of 391230 is about 73.1381633108.

391230 divided by its product of nonzero digits (162) gives a triangular number (2415 = T₆₉).

The spelling of 391230 in words is "three hundred ninety-one thousand, two hundred thirty".