391377 has 8 divisors (see below), whose sum is σ = 596416. Its totient is φ = 223632.

The previous prime is 391373. The next prime is 391379. The reversal of 391377 is 773193.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 391377 - 2² = 391373 is a prime.

It is a super-2 number, since 2×391377² = 306351912258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9298 + ... + 9339.

It is an arithmetic number, because the mean of its divisors is an integer number (74552).

2³⁹¹³⁷⁷ is an apocalyptic number.

It is an amenable number.

391377 is a deficient number, since it is larger than the sum of its proper divisors (205039).

391377 is a wasteful number, since it uses less digits than its factorization.

391377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18647.

The product of its digits is 3969, while the sum is 30.

The square root of 391377 is about 625.6013107403. The cubic root of 391377 is about 73.1473224275.

The spelling of 391377 in words is "three hundred ninety-one thousand, three hundred seventy-seven".