391469 has 4 divisors (see below), whose sum is σ = 421596. Its totient is φ = 361344.

The previous prime is 391453. The next prime is 391487. The reversal of 391469 is 964193.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 220900 + 170569 = 470^2 + 413^2 .

It is a cyclic number.

It is not a de Polignac number, because 391469 - 2⁴ = 391453 is a prime.

It is a super-2 number, since 2×391469² = 306495955922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15044 + ... + 15069.

It is an arithmetic number, because the mean of its divisors is an integer number (105399).

2³⁹¹⁴⁶⁹ is an apocalyptic number.

It is an amenable number.

391469 is a deficient number, since it is larger than the sum of its proper divisors (30127).

391469 is a wasteful number, since it uses less digits than its factorization.

391469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30126.

The product of its digits is 5832, while the sum is 32.

The square root of 391469 is about 625.6748356774. The cubic root of 391469 is about 73.1530534971.

It can be divided in two parts, 39 and 1469, that multiplied together give a triangular number (57291 = T₃₃₈).

The spelling of 391469 in words is "three hundred ninety-one thousand, four hundred sixty-nine".