40120661 has 12 divisors (see below), whose sum is σ = 46889568. Its totient is φ = 34228152.

The previous prime is 40120651. The next prime is 40120667. The reversal of 40120661 is 16602104.

It is a happy number.

It is not a de Polignac number, because 40120661 - 2¹⁰ = 40119637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40120667) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 9320 + ... + 12926.

It is an arithmetic number, because the mean of its divisors is an integer number (3907464).

Almost surely, 2^40120661 is an apocalyptic number.

It is an amenable number.

40120661 is a deficient number, since it is larger than the sum of its proper divisors (6768907).

40120661 is a wasteful number, since it uses less digits than its factorization.

40120661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3848 (or 3841 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 40120661 is about 6334.0872270596. The cubic root of 40120661 is about 342.3387231533.

Adding to 40120661 its reverse (16602104), we get a palindrome (56722765).

The spelling of 40120661 in words is "forty million, one hundred twenty thousand, six hundred sixty-one".