40443653 has 2 divisors, whose sum is σ = 40443654. Its totient is φ = 40443652.

The previous prime is 40443643. The next prime is 40443673. The reversal of 40443653 is 35634404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38962564 + 1481089 = 6242^2 + 1217^2 .

It is a cyclic number.

It is not a de Polignac number, because 40443653 - 2¹⁰ = 40442629 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40443643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20221826 + 20221827.

It is an arithmetic number, because the mean of its divisors is an integer number (20221827).

Almost surely, 2^40443653 is an apocalyptic number.

It is an amenable number.

40443653 is a deficient number, since it is larger than the sum of its proper divisors (1).

40443653 is an equidigital number, since it uses as much as digits as its factorization.

40443653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 29.

The square root of 40443653 is about 6359.5324513678. The cubic root of 40443653 is about 343.2549365938.

Subtracting from 40443653 its reverse (35634404), we obtain a square (4809249 = 2193²).

The spelling of 40443653 in words is "forty million, four hundred forty-three thousand, six hundred fifty-three".