40413649 has 2 divisors, whose sum is σ = 40413650. Its totient is φ = 40413648.

The previous prime is 40413647. The next prime is 40413661. The reversal of 40413649 is 94631404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27040000 + 13373649 = 5200^2 + 3657^2 .

It is a cyclic number.

It is not a de Polignac number, because 40413649 - 2¹ = 40413647 is a prime.

Together with 40413647, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 40413649.

It is not a weakly prime, because it can be changed into another prime (40413647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20206824 + 20206825.

It is an arithmetic number, because the mean of its divisors is an integer number (20206825).

Almost surely, 2^40413649 is an apocalyptic number.

It is an amenable number.

40413649 is a deficient number, since it is larger than the sum of its proper divisors (1).

40413649 is an equidigital number, since it uses as much as digits as its factorization.

40413649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 40413649 is about 6357.1730352414. The cubic root of 40413649 is about 343.1700318910.

The spelling of 40413649 in words is "forty million, four hundred thirteen thousand, six hundred forty-nine".