400542844 has 36 divisors (see below), whose sum is σ = 762574176. Its totient is φ = 184000128.

The previous prime is 400542841. The next prime is 400542859. The reversal of 400542844 is 448245004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400542841) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 156237 + ... + 158779.

It is an arithmetic number, because the mean of its divisors is an integer number (21182616).

Almost surely, 2^400542844 is an apocalyptic number.

It is an amenable number.

400542844 is a deficient number, since it is larger than the sum of its proper divisors (362031332).

400542844 is a wasteful number, since it uses less digits than its factorization.

400542844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2806 (or 2791 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 31.

The square root of 400542844 is about 20013.5664987528. The cubic root of 400542844 is about 737.1394581284.

Adding to 400542844 its reverse (448245004), we get a palindrome (848787848).

The spelling of 400542844 in words is "four hundred million, five hundred forty-two thousand, eight hundred forty-four".