40244381 has 2 divisors, whose sum is σ = 40244382. Its totient is φ = 40244380.

The previous prime is 40244371. The next prime is 40244383. The reversal of 40244381 is 18344204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40208281 + 36100 = 6341^2 + 190^2 .

It is a cyclic number.

It is not a de Polignac number, because 40244381 - 2⁶ = 40244317 is a prime.

It is a super-2 number, since 2×40244381² = 3239220404146322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 40244383, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40244381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40244383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20122190 + 20122191.

It is an arithmetic number, because the mean of its divisors is an integer number (20122191).

Almost surely, 2^40244381 is an apocalyptic number.

It is an amenable number.

40244381 is a deficient number, since it is larger than the sum of its proper divisors (1).

40244381 is an equidigital number, since it uses as much as digits as its factorization.

40244381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 40244381 is about 6343.8459155311. The cubic root of 40244381 is about 342.6902518038.

Adding to 40244381 its reverse (18344204), we get a palindrome (58588585).

The spelling of 40244381 in words is "forty million, two hundred forty-four thousand, three hundred eighty-one".