40566997 has 4 divisors (see below), whose sum is σ = 41055840. Its totient is φ = 40078156.

The previous prime is 40566973. The next prime is 40567019. The reversal of 40566997 is 79966504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40566997 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 (40566937) 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 3 ways as a sum of consecutive naturals, for example, 244297 + ... + 244462.

It is an arithmetic number, because the mean of its divisors is an integer number (10263960).

Almost surely, 2^40566997 is an apocalyptic number.

It is an amenable number.

40566997 is a deficient number, since it is larger than the sum of its proper divisors (488843).

40566997 is an equidigital number, since it uses as much as digits as its factorization.

40566997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488842.

The product of its (nonzero) digits is 408240, while the sum is 46.

The square root of 40566997 is about 6369.2226370257. Note that the first 3 decimals coincide. The cubic root of 40566997 is about 343.6035324439.

The spelling of 40566997 in words is "forty million, five hundred sixty-six thousand, nine hundred ninety-seven".