40818817 has 4 divisors (see below), whose sum is σ = 43958740. Its totient is φ = 37678896.

The previous prime is 40818803. The next prime is 40818829. The reversal of 40818817 is 71881804.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16573041 + 24245776 = 4071^2 + 4924^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40818817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40818857) 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, 1569942 + ... + 1569967.

It is an arithmetic number, because the mean of its divisors is an integer number (10989685).

Almost surely, 2^40818817 is an apocalyptic number.

It is an amenable number.

40818817 is a deficient number, since it is larger than the sum of its proper divisors (3139923).

40818817 is a wasteful number, since it uses less digits than its factorization.

40818817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3139922.

The product of its (nonzero) digits is 14336, while the sum is 37.

The square root of 40818817 is about 6388.9605570859. The cubic root of 40818817 is about 344.3130403800.

The spelling of 40818817 in words is "forty million, eight hundred eighteen thousand, eight hundred seventeen".