40573661 has 4 divisors (see below), whose sum is σ = 40587612. Its totient is φ = 40559712.

The previous prime is 40573609. The next prime is 40573691. The reversal of 40573661 is 16637504.

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 36844900 + 3728761 = 6070^2 + 1931^2 .

It is a cyclic number.

It is not a de Polignac number, because 40573661 - 2¹⁴ = 40557277 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 (40573691) 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, 776 + ... + 9041.

It is an arithmetic number, because the mean of its divisors is an integer number (10146903).

Almost surely, 2^40573661 is an apocalyptic number.

It is an amenable number.

40573661 is a deficient number, since it is larger than the sum of its proper divisors (13951).

40573661 is an equidigital number, since it uses as much as digits as its factorization.

40573661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13950.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 40573661 is about 6369.7457563077. The cubic root of 40573661 is about 343.6223461655.

The spelling of 40573661 in words is "forty million, five hundred seventy-three thousand, six hundred sixty-one".