391297 has 8 divisors (see below), whose sum is σ = 411840. Its totient is φ = 371280.

The previous prime is 391291. The next prime is 391301. The reversal of 391297 is 792193.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-391297 is a prime.

It is a super-2 number, since 2×391297² = 306226684418, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

391297 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (391291) 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, 2922 + ... + 3052.

It is an arithmetic number, because the mean of its divisors is an integer number (51480).

2³⁹¹²⁹⁷ is an apocalyptic number.

It is an amenable number.

391297 is a deficient number, since it is larger than the sum of its proper divisors (20543).

391297 is a wasteful number, since it uses less digits than its factorization.

391297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263.

The product of its digits is 3402, while the sum is 31.

The square root of 391297 is about 625.5373689877. The cubic root of 391297 is about 73.1423381587.

The spelling of 391297 in words is "three hundred ninety-one thousand, two hundred ninety-seven".