400045243 has 4 divisors (see below), whose sum is σ = 430817968. Its totient is φ = 369272520.

The previous prime is 400045237. The next prime is 400045267. The reversal of 400045243 is 342540004.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400045243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400045213) 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, 15386343 + ... + 15386368.

It is an arithmetic number, because the mean of its divisors is an integer number (107704492).

Almost surely, 2^400045243 is an apocalyptic number.

400045243 is a deficient number, since it is larger than the sum of its proper divisors (30772725).

400045243 is a wasteful number, since it uses less digits than its factorization.

400045243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30772724.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 400045243 is about 20001.1310430185. The cubic root of 400045243 is about 736.8340781203.

Adding to 400045243 its reverse (342540004), we get a palindrome (742585247).

The spelling of 400045243 in words is "four hundred million, forty-five thousand, two hundred forty-three".