40564999 has 4 divisors (see below), whose sum is σ = 41078560. Its totient is φ = 40051440.

The previous prime is 40564991. The next prime is 40565003. The reversal of 40564999 is 99946504.

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

It is a cyclic number.

It is not a de Polignac number, because 40564999 - 2³ = 40564991 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 (40564991) 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, 256662 + ... + 256819.

It is an arithmetic number, because the mean of its divisors is an integer number (10269640).

Almost surely, 2^40564999 is an apocalyptic number.

40564999 is a deficient number, since it is larger than the sum of its proper divisors (513561).

40564999 is an equidigital number, since it uses as much as digits as its factorization.

40564999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513560.

The product of its (nonzero) digits is 349920, while the sum is 46.

The square root of 40564999 is about 6369.0657870680. The cubic root of 40564999 is about 343.5978913137.

The spelling of 40564999 in words is "forty million, five hundred sixty-four thousand, nine hundred ninety-nine".