391407 has 4 divisors (see below), whose sum is σ = 521880. Its totient is φ = 260936.

The previous prime is 391403. The next prime is 391441. The reversal of 391407 is 704193.

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

It is a cyclic number.

It is not a de Polignac number, because 391407 - 2² = 391403 is a prime.

It is a D-number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 391407.

It is not an unprimeable number, because it can be changed into a prime (391403) 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, 65232 + ... + 65237.

It is an arithmetic number, because the mean of its divisors is an integer number (130470).

2³⁹¹⁴⁰⁷ is an apocalyptic number.

391407 is a deficient number, since it is larger than the sum of its proper divisors (130473).

391407 is a wasteful number, since it uses less digits than its factorization.

391407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130472.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 391407 is about 625.6252872127. The cubic root of 391407 is about 73.1491913532.

The spelling of 391407 in words is "three hundred ninety-one thousand, four hundred seven".