40209944 has 8 divisors (see below), whose sum is σ = 75393660. Its totient is φ = 20104968.

The previous prime is 40209943. The next prime is 40209989. The reversal of 40209944 is 44990204.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 40209944.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40209943) 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 as a sum of consecutive naturals, namely, 2513114 + ... + 2513129.

Almost surely, 2^40209944 is an apocalyptic number.

It is an amenable number.

40209944 is a deficient number, since it is larger than the sum of its proper divisors (35183716).

40209944 is a wasteful number, since it uses less digits than its factorization.

40209944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5026249 (or 5026245 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 40209944 is about 6341.1311293806. The cubic root of 40209944 is about 342.5924775589.

The spelling of 40209944 in words is "forty million, two hundred nine thousand, nine hundred forty-four".