40143644 has 24 divisors (see below), whose sum is σ = 71536080. Its totient is φ = 19708416.

The previous prime is 40143641. The next prime is 40143661. The reversal of 40143644 is 44634104.

It is a super-2 number, since 2×40143644² = 3223024307197472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40143641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60587 + ... + 61245.

It is an arithmetic number, because the mean of its divisors is an integer number (2980670).

Almost surely, 2^40143644 is an apocalyptic number.

It is an amenable number.

40143644 is a deficient number, since it is larger than the sum of its proper divisors (31392436).

40143644 is a wasteful number, since it uses less digits than its factorization.

40143644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917 (or 915 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 40143644 is about 6335.9011987246. The cubic root of 40143644 is about 342.4040799111.

Adding to 40143644 its reverse (44634104), we get a palindrome (84777748).

The spelling of 40143644 in words is "forty million, one hundred forty-three thousand, six hundred forty-four".