391867 has 16 divisors (see below), whose sum is σ = 492480. Its totient is φ = 304128.

The previous prime is 391861. The next prime is 391873. The reversal of 391867 is 768193.

It is an interprime number because it is at equal distance from previous prime (391861) and next prime (391873).

It is a cyclic number.

It is not a de Polignac number, because 391867 - 2⁷ = 391739 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4359 + ... + 4447.

It is an arithmetic number, because the mean of its divisors is an integer number (30780).

2³⁹¹⁸⁶⁷ is an apocalyptic number.

391867 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

391867 is a deficient number, since it is larger than the sum of its proper divisors (100613).

391867 is a wasteful number, since it uses less digits than its factorization.

391867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150.

The product of its digits is 9072, while the sum is 34.

The square root of 391867 is about 625.9928114603. The cubic root of 391867 is about 73.1778362632.

It can be divided in two parts, 39186 and 7, that added together give a palindrome (39193).

The spelling of 391867 in words is "three hundred ninety-one thousand, eight hundred sixty-seven".