40721144 has 16 divisors (see below), whose sum is σ = 76577400. Its totient is φ = 20300512.

The previous prime is 40721089. The next prime is 40721167. The reversal of 40721144 is 44112704.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4559 + ... + 10110.

Almost surely, 2^40721144 is an apocalyptic number.

It is an amenable number.

40721144 is a deficient number, since it is larger than the sum of its proper divisors (35856256).

40721144 is a wasteful number, since it uses less digits than its factorization.

40721144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15022 (or 15018 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 40721144 is about 6381.3120907851. The cubic root of 40721144 is about 344.0381920820.

Adding to 40721144 its reverse (44112704), we get a palindrome (84833848).

The spelling of 40721144 in words is "forty million, seven hundred twenty-one thousand, one hundred forty-four".