40566399 has 4 divisors (see below), whose sum is σ = 54088536. Its totient is φ = 27044264.

The previous prime is 40566397. The next prime is 40566401. The reversal of 40566399 is 99366504.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (40566397) and next prime (40566401).

It is a cyclic number.

It is not a de Polignac number, because 40566399 - 2¹ = 40566397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40566399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40566391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6761064 + ... + 6761069.

It is an arithmetic number, because the mean of its divisors is an integer number (13522134).

Almost surely, 2^40566399 is an apocalyptic number.

40566399 is a deficient number, since it is larger than the sum of its proper divisors (13522137).

40566399 is a wasteful number, since it uses less digits than its factorization.

40566399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13522136.

The product of its (nonzero) digits is 174960, while the sum is 42.

The square root of 40566399 is about 6369.1756923483. The cubic root of 40566399 is about 343.6018440770.

The spelling of 40566399 in words is "forty million, five hundred sixty-six thousand, three hundred ninety-nine".