40749817 has 2 divisors, whose sum is σ = 40749818. Its totient is φ = 40749816.

The previous prime is 40749809. The next prime is 40749823. The reversal of 40749817 is 71894704.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38303721 + 2446096 = 6189^2 + 1564^2 .

It is a cyclic number.

It is not a de Polignac number, because 40749817 - 2³ = 40749809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40749817.

It is not a weakly prime, because it can be changed into another prime (40749857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20374908 + 20374909.

It is an arithmetic number, because the mean of its divisors is an integer number (20374909).

Almost surely, 2^40749817 is an apocalyptic number.

It is an amenable number.

40749817 is a deficient number, since it is larger than the sum of its proper divisors (1).

40749817 is an equidigital number, since it uses as much as digits as its factorization.

40749817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 40749817 is about 6383.5583337195. The cubic root of 40749817 is about 344.1189223996.

The spelling of 40749817 in words is "forty million, seven hundred forty-nine thousand, eight hundred seventeen".