400493 has 4 divisors (see below), whose sum is σ = 401760. Its totient is φ = 399228.

The previous prime is 400481. The next prime is 400523. The reversal of 400493 is 394004.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 400493 - 2⁶ = 400429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400093) 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, 296 + ... + 942.

It is an arithmetic number, because the mean of its divisors is an integer number (100440).

2⁴⁰⁰⁴⁹³ is an apocalyptic number.

It is an amenable number.

400493 is a deficient number, since it is larger than the sum of its proper divisors (1267).

400493 is an equidigital number, since it uses as much as digits as its factorization.

400493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 400493 is about 632.8451627373. The cubic root of 400493 is about 73.7108880040.

Adding to 400493 its reverse (394004), we get a palindrome (794497).

The spelling of 400493 in words is "four hundred thousand, four hundred ninety-three".