40343220 has 36 divisors (see below), whose sum is σ = 122374980. Its totient is φ = 10758144.

The previous prime is 40343207. The next prime is 40343239. The reversal of 40343220 is 2234304.

40343220 is a `hidden beast` number, since 403 + 43 + 220 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 30869136 + 9474084 = 5556^2 + 3078^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 40343193 and 40343202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111885 + ... + 112244.

It is an arithmetic number, because the mean of its divisors is an integer number (3399305).

Almost surely, 2^40343220 is an apocalyptic number.

It is an amenable number.

40343220 is an abundant number, since it is smaller than the sum of its proper divisors (82031760).

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

40343220 is a wasteful number, since it uses less digits than its factorization.

40343220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224144 (or 224139 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

The square root of 40343220 is about 6351.6312865279. The cubic root of 40343220 is about 342.9705681269.

Adding to 40343220 its reverse (2234304), we get a palindrome (42577524).

The spelling of 40343220 in words is "forty million, three hundred forty-three thousand, two hundred twenty".