391662 has 16 divisors (see below), whose sum is σ = 870480. Its totient is φ = 130536.

The previous prime is 391661. The next prime is 391679. The reversal of 391662 is 266193.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391661) 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, 3573 + ... + 3680.

It is an arithmetic number, because the mean of its divisors is an integer number (54405).

2³⁹¹⁶⁶² is an apocalyptic number.

391662 is an abundant number, since it is smaller than the sum of its proper divisors (478818).

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

391662 is a wasteful number, since it uses less digits than its factorization.

391662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7264 (or 7258 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 391662 is about 625.8290501407. The cubic root of 391662 is about 73.1650733673.

The spelling of 391662 in words is "three hundred ninety-one thousand, six hundred sixty-two".