40147381 has 2 divisors, whose sum is σ = 40147382. Its totient is φ = 40147380.

The previous prime is 40147379. The next prime is 40147391. The reversal of 40147381 is 18374104.

40147381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30747025 + 9400356 = 5545^2 + 3066^2 .

It is a cyclic number.

It is not a de Polignac number, because 40147381 - 2¹ = 40147379 is a prime.

It is a super-2 number, since 2×40147381² = 3223624402318322, which contains 22 as substring.

Together with 40147379, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40147391) 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, 20073690 + 20073691.

It is an arithmetic number, because the mean of its divisors is an integer number (20073691).

Almost surely, 2^40147381 is an apocalyptic number.

It is an amenable number.

40147381 is a deficient number, since it is larger than the sum of its proper divisors (1).

40147381 is an equidigital number, since it uses as much as digits as its factorization.

40147381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 40147381 is about 6336.1960986068. The cubic root of 40147381 is about 342.4147044601.

The spelling of 40147381 in words is "forty million, one hundred forty-seven thousand, three hundred eighty-one".