391449 has 4 divisors (see below), whose sum is σ = 521936. Its totient is φ = 260964.

The previous prime is 391441. The next prime is 391451. The reversal of 391449 is 944193.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 391449 - 2³ = 391441 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391441) 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 3 ways as a sum of consecutive naturals, for example, 65239 + ... + 65244.

It is an arithmetic number, because the mean of its divisors is an integer number (130484).

2³⁹¹⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

391449 is a deficient number, since it is larger than the sum of its proper divisors (130487).

391449 is a wasteful number, since it uses less digits than its factorization.

391449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130486.

The product of its digits is 3888, while the sum is 30.

The square root of 391449 is about 625.6588527305. The cubic root of 391449 is about 73.1518076888.

The spelling of 391449 in words is "three hundred ninety-one thousand, four hundred forty-nine".