400042844 has 12 divisors (see below), whose sum is σ = 741255984. Its totient is φ = 188255424.

The previous prime is 400042843. The next prime is 400042919. The reversal of 400042844 is 448240004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400042843) 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, 2941424 + ... + 2941559.

It is an arithmetic number, because the mean of its divisors is an integer number (61771332).

Almost surely, 2^400042844 is an apocalyptic number.

It is an amenable number.

400042844 is a deficient number, since it is larger than the sum of its proper divisors (341213140).

400042844 is a wasteful number, since it uses less digits than its factorization.

400042844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5883004 (or 5883002 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 26.

The square root of 400042844 is about 20001.0710713202. The cubic root of 400042844 is about 736.8326052298.

Adding to 400042844 its reverse (448240004), we get a palindrome (848282848).

The spelling of 400042844 in words is "four hundred million, forty-two thousand, eight hundred forty-four".