400063 has 4 divisors (see below), whose sum is σ = 402040. Its totient is φ = 398088.

The previous prime is 400051. The next prime is 400067. The reversal of 400063 is 360004.

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 400063 - 2⁵ = 400031 is a prime.

It is a Duffinian number.

400063 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400067) 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, 645 + ... + 1102.

It is an arithmetic number, because the mean of its divisors is an integer number (100510).

2⁴⁰⁰⁰⁶³ is an apocalyptic number.

400063 is a deficient number, since it is larger than the sum of its proper divisors (1977).

400063 is a wasteful number, since it uses less digits than its factorization.

400063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1976.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 400063 is about 632.5053359459. The cubic root of 400063 is about 73.6844980028.

Adding to 400063 its reverse (360004), we get a palindrome (760067).

The spelling of 400063 in words is "four hundred thousand, sixty-three".