40365644 has 24 divisors (see below), whose sum is σ = 80414208. Its totient is φ = 17549840.

The previous prime is 40365641. The next prime is 40365649. The reversal of 40365644 is 44656304.

It is a self number, because there is not a number n which added to its sum of digits gives 40365644.

It is not an unprimeable number, because it can be changed into a prime (40365641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18932 + ... + 20955.

It is an arithmetic number, because the mean of its divisors is an integer number (3350592).

Almost surely, 2^40365644 is an apocalyptic number.

40365644 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

40365644 is a deficient number, since it is larger than the sum of its proper divisors (40048564).

40365644 is a wasteful number, since it uses less digits than its factorization.

40365644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39925 (or 39923 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 40365644 is about 6353.3962571211. The cubic root of 40365644 is about 343.0341008802.

The spelling of 40365644 in words is "forty million, three hundred sixty-five thousand, six hundred forty-four".