40049381 has 2 divisors, whose sum is σ = 40049382. Its totient is φ = 40049380.

The previous prime is 40049353. The next prime is 40049389. The reversal of 40049381 is 18394004.

40049381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20557156 + 19492225 = 4534^2 + 4415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40049381 is a prime.

It is a super-2 number, since 2×40049381² = 3207905836966322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40049389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20024690 + 20024691.

It is an arithmetic number, because the mean of its divisors is an integer number (20024691).

Almost surely, 2^40049381 is an apocalyptic number.

It is an amenable number.

40049381 is a deficient number, since it is larger than the sum of its proper divisors (1).

40049381 is an equidigital number, since it uses as much as digits as its factorization.

40049381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 40049381 is about 6328.4580270394. The cubic root of 40049381 is about 342.1358653322.

The spelling of 40049381 in words is "forty million, forty-nine thousand, three hundred eighty-one".