40261661 has 36 divisors (see below), whose sum is σ = 50307516. Its totient is φ = 32060160.

The previous prime is 40261651. The next prime is 40261679. The reversal of 40261661 is 16616204.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 33860761 + 6400900 = 5819^2 + 2530^2 .

It is not a de Polignac number, because 40261661 - 2⁶ = 40261597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40261661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40261601) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1088135 + ... + 1088171.

It is an arithmetic number, because the mean of its divisors is an integer number (1397431).

Almost surely, 2^40261661 is an apocalyptic number.

It is an amenable number.

40261661 is a deficient number, since it is larger than the sum of its proper divisors (10045855).

40261661 is a wasteful number, since it uses less digits than its factorization.

40261661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 40261661 is about 6345.2077192161. The cubic root of 40261661 is about 342.7392925234.

Adding to 40261661 its reverse (16616204), we get a palindrome (56877865).

The spelling of 40261661 in words is "forty million, two hundred sixty-one thousand, six hundred sixty-one".