403491 has 8 divisors (see below), whose sum is σ = 586944. Its totient is φ = 244520.

The previous prime is 403483. The next prime is 403499. The reversal of 403491 is 194304.

It is an interprime number because it is at equal distance from previous prime (403483) and next prime (403499).

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

It is a cyclic number.

It is not a de Polignac number, because 403491 - 2³ = 403483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (403499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6081 + ... + 6146.

It is an arithmetic number, because the mean of its divisors is an integer number (73368).

2⁴⁰³⁴⁹¹ is an apocalyptic number.

403491 is a deficient number, since it is larger than the sum of its proper divisors (183453).

403491 is a wasteful number, since it uses less digits than its factorization.

403491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12241.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 403491 is about 635.2094142879. The cubic root of 403491 is about 73.8943586339.

Adding to 403491 its reverse (194304), we get a palindrome (597795).

The spelling of 403491 in words is "four hundred three thousand, four hundred ninety-one".