40849381 has 2 divisors, whose sum is σ = 40849382. Its totient is φ = 40849380.

The previous prime is 40849343. The next prime is 40849409. The reversal of 40849381 is 18394804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37576900 + 3272481 = 6130^2 + 1809^2 .

It is a cyclic number.

It is not a de Polignac number, because 40849381 - 2⁷ = 40849253 is a prime.

It is a super-2 number, since 2×40849381² = 3337343856166322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40849381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40849481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20424690 + 20424691.

It is an arithmetic number, because the mean of its divisors is an integer number (20424691).

Almost surely, 2^40849381 is an apocalyptic number.

It is an amenable number.

40849381 is a deficient number, since it is larger than the sum of its proper divisors (1).

40849381 is an equidigital number, since it uses as much as digits as its factorization.

40849381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 40849381 is about 6391.3520478847. The cubic root of 40849381 is about 344.3989562969.

The spelling of 40849381 in words is "forty million, eight hundred forty-nine thousand, three hundred eighty-one".