40899643 has 4 divisors (see below), whose sum is σ = 41417440. Its totient is φ = 40381848.

The previous prime is 40899631. The next prime is 40899653. The reversal of 40899643 is 34699804.

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 40899643 - 2¹⁷ = 40768571 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 40899643.

It is not an unprimeable number, because it can be changed into a prime (40899613) 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, 258780 + ... + 258937.

It is an arithmetic number, because the mean of its divisors is an integer number (10354360).

Almost surely, 2^40899643 is an apocalyptic number.

40899643 is a deficient number, since it is larger than the sum of its proper divisors (517797).

40899643 is an equidigital number, since it uses as much as digits as its factorization.

40899643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517796.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 40899643 is about 6395.2828709917. The cubic root of 40899643 is about 344.5401504852.

The spelling of 40899643 in words is "forty million, eight hundred ninety-nine thousand, six hundred forty-three".