40002444 has 48 divisors (see below), whose sum is σ = 104358240. Its totient is φ = 13250880.

The previous prime is 40002437. The next prime is 40002463. The reversal of 40002444 is 44420004.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 17614 + ... + 19754.

It is an arithmetic number, because the mean of its divisors is an integer number (2174130).

Almost surely, 2^40002444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40002444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52179120).

40002444 is an abundant number, since it is smaller than the sum of its proper divisors (64355796).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40002444 is a wasteful number, since it uses less digits than its factorization.

40002444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2327 (or 2319 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 40002444 is about 6324.7485325505. The cubic root of 40002444 is about 342.0021544955.

Adding to 40002444 its reverse (44420004), we get a palindrome (84422448).

The spelling of 40002444 in words is "forty million, two thousand, four hundred forty-four".