391748 has 24 divisors (see below), whose sum is σ = 830592. Its totient is φ = 157824.

The previous prime is 391739. The next prime is 391751. The reversal of 391748 is 847193.

391748 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 391748.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65 + ... + 887.

It is an arithmetic number, because the mean of its divisors is an integer number (34608).

2³⁹¹⁷⁴⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 391748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (415296).

391748 is an abundant number, since it is smaller than the sum of its proper divisors (438844).

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

391748 is a wasteful number, since it uses less digits than its factorization.

391748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851 (or 849 counting only the distinct ones).

The product of its digits is 6048, while the sum is 32.

The square root of 391748 is about 625.8977552284. The cubic root of 391748 is about 73.1704280999.

The spelling of 391748 in words is "three hundred ninety-one thousand, seven hundred forty-eight".