40053661 has 4 divisors (see below), whose sum is σ = 40066972. Its totient is φ = 40040352.

The previous prime is 40053659. The next prime is 40053677. The reversal of 40053661 is 16635004.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 22033636 + 18020025 = 4694^2 + 4245^2 .

It is a cyclic number.

It is not a de Polignac number, because 40053661 - 2¹ = 40053659 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 (40053161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241 + ... + 8953.

It is an arithmetic number, because the mean of its divisors is an integer number (10016743).

Almost surely, 2^40053661 is an apocalyptic number.

It is an amenable number.

40053661 is a deficient number, since it is larger than the sum of its proper divisors (13311).

40053661 is an equidigital number, since it uses as much as digits as its factorization.

40053661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13310.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 40053661 is about 6328.7961730490. The cubic root of 40053661 is about 342.1480526978.

Adding to 40053661 its reverse (16635004), we get a palindrome (56688665).

The spelling of 40053661 in words is "forty million, fifty-three thousand, six hundred sixty-one".