400450123 has 4 divisors (see below), whose sum is σ = 400915008. Its totient is φ = 399985240.

The previous prime is 400450121. The next prime is 400450129. The reversal of 400450123 is 321054004.

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 400450123 - 2¹ = 400450121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400450123.

It is not an unprimeable number, because it can be changed into a prime (400450121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231148 + ... + 232873.

It is an arithmetic number, because the mean of its divisors is an integer number (100228752).

Almost surely, 2^400450123 is an apocalyptic number.

400450123 is a deficient number, since it is larger than the sum of its proper divisors (464885).

400450123 is an equidigital number, since it uses as much as digits as its factorization.

400450123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464884.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 400450123 is about 20011.2499109876. The cubic root of 400450123 is about 737.0825740078.

The spelling of 400450123 in words is "four hundred million, four hundred fifty thousand, one hundred twenty-three".