391401 has 12 divisors (see below), whose sum is σ = 571012. Its totient is φ = 258336.

The previous prime is 391399. The next prime is 391403. The reversal of 391401 is 104193.

It is an interprime number because it is at equal distance from previous prime (391399) and next prime (391403).

It can be written as a sum of positive squares in 2 ways, for example, as 90000 + 301401 = 300^2 + 549^2 .

It is not a de Polignac number, because 391401 - 2¹ = 391399 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 391401.

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 11 ways as a sum of consecutive naturals, for example, 1275 + ... + 1551.

2³⁹¹⁴⁰¹ is an apocalyptic number.

It is an amenable number.

391401 is a deficient number, since it is larger than the sum of its proper divisors (179611).

391401 is a wasteful number, since it uses less digits than its factorization.

391401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 391401 is about 625.6204919918. The cubic root of 391401 is about 73.1488175757.

Adding to 391401 its reverse (104193), we get a palindrome (495594).

The spelling of 391401 in words is "three hundred ninety-one thousand, four hundred one".