400445123 has 16 divisors (see below), whose sum is σ = 443874816. Its totient is φ = 358943520.

The previous prime is 400445119. The next prime is 400445161. The reversal of 400445123 is 321544004.

It is not a de Polignac number, because 400445123 - 2² = 400445119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400445723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77540 + ... + 82542.

It is an arithmetic number, because the mean of its divisors is an integer number (27742176).

Almost surely, 2^400445123 is an apocalyptic number.

400445123 is a deficient number, since it is larger than the sum of its proper divisors (43429693).

400445123 is a wasteful number, since it uses less digits than its factorization.

400445123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5194.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 400445123 is about 20011.1249808700. The cubic root of 400445123 is about 737.0795062698.

Adding to 400445123 its reverse (321544004), we get a palindrome (721989127).

The spelling of 400445123 in words is "four hundred million, four hundred forty-five thousand, one hundred twenty-three".