400236644 has 12 divisors (see below), whose sum is σ = 741615084. Its totient is φ = 188346624.

The previous prime is 400236643. The next prime is 400236667. The reversal of 400236644 is 446632004.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 171924544 + 228312100 = 13112^2 + 15110^2 .

It is not an unprimeable number, because it can be changed into a prime (400236643) 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, 2942849 + ... + 2942984.

It is an arithmetic number, because the mean of its divisors is an integer number (61801257).

Almost surely, 2^400236644 is an apocalyptic number.

It is an amenable number.

400236644 is a deficient number, since it is larger than the sum of its proper divisors (341378440).

400236644 is a wasteful number, since it uses less digits than its factorization.

400236644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5885854 (or 5885852 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 29.

The square root of 400236644 is about 20005.9152252528. The cubic root of 400236644 is about 736.9515717420.

Adding to 400236644 its reverse (446632004), we get a palindrome (846868648).

The spelling of 400236644 in words is "four hundred million, two hundred thirty-six thousand, six hundred forty-four".