40281216 has 64 divisors (see below), whose sum is σ = 112648800. Its totient is φ = 12718080.

The previous prime is 40281193. The next prime is 40281221. The reversal of 40281216 is 61218204.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4536 + ... + 10056.

Almost surely, 2^40281216 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 40281216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56324400).

40281216 is an abundant number, since it is smaller than the sum of its proper divisors (72367584).

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

40281216 is a wasteful number, since it uses less digits than its factorization.

40281216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5557 (or 5545 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 40281216 is about 6346.7484588567. The cubic root of 40281216 is about 342.7947727818.

It can be divided in two parts, 402 and 81216, that added together give a palindrome (81618).

The spelling of 40281216 in words is "forty million, two hundred eighty-one thousand, two hundred sixteen".