400623 has 4 divisors (see below), whose sum is σ = 534168. Its totient is φ = 267080.

The previous prime is 400619. The next prime is 400643. The reversal of 400623 is 326004.

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 400623 - 2² = 400619 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400643) 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, 66768 + ... + 66773.

It is an arithmetic number, because the mean of its divisors is an integer number (133542).

2⁴⁰⁰⁶²³ is an apocalyptic number.

400623 is a deficient number, since it is larger than the sum of its proper divisors (133545).

400623 is a wasteful number, since it uses less digits than its factorization.

400623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133544.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 400623 is about 632.9478651516. The cubic root of 400623 is about 73.7188626576.

Adding to 400623 its reverse (326004), we get a palindrome (726627).

The spelling of 400623 in words is "four hundred thousand, six hundred twenty-three".