40821775 has 6 divisors (see below), whose sum is σ = 50619032. Its totient is φ = 32657400.

The previous prime is 40821707. The next prime is 40821779. The reversal of 40821775 is 57712804.

It is a happy number.

It is not a de Polignac number, because 40821775 - 2¹⁹ = 40297487 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 40821775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40821779) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 816411 + ... + 816460.

Almost surely, 2^40821775 is an apocalyptic number.

40821775 is a deficient number, since it is larger than the sum of its proper divisors (9797257).

40821775 is a wasteful number, since it uses less digits than its factorization.

40821775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632881 (or 1632876 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 40821775 is about 6389.1920459476. The cubic root of 40821775 is about 344.3213572418.

The spelling of 40821775 in words is "forty million, eight hundred twenty-one thousand, seven hundred seventy-five".