40211661 has 16 divisors (see below), whose sum is σ = 63388800. Its totient is φ = 22185408.

The previous prime is 40211621. The next prime is 40211663. The reversal of 40211661 is 16611204.

40211661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40211661 - 2⁶ = 40211597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40211663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32406 + ... + 33623.

It is an arithmetic number, because the mean of its divisors is an integer number (3961800).

Almost surely, 2^40211661 is an apocalyptic number.

It is an amenable number.

40211661 is a deficient number, since it is larger than the sum of its proper divisors (23177139).

40211661 is a wasteful number, since it uses less digits than its factorization.

40211661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66068.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 40211661 is about 6341.2665138756. The cubic root of 40211661 is about 342.5973538229.

Adding to 40211661 its reverse (16611204), we get a palindrome (56822865).

The spelling of 40211661 in words is "forty million, two hundred eleven thousand, six hundred sixty-one".