40447072381 has 2 divisors, whose sum is σ = 40447072382. Its totient is φ = 40447072380.

The previous prime is 40447072331. The next prime is 40447072397. The reversal of 40447072381 is 18327074404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34800902500 + 5646169881 = 186550^2 + 75141^2 .

It is a cyclic number.

It is not a de Polignac number, because 40447072381 - 2¹¹ = 40447070333 is a prime.

It is a super-2 number, since 2×40447072381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40447072321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20223536190 + 20223536191.

It is an arithmetic number, because the mean of its divisors is an integer number (20223536191).

Almost surely, 2^40447072381 is an apocalyptic number.

It is an amenable number.

40447072381 is a deficient number, since it is larger than the sum of its proper divisors (1).

40447072381 is an equidigital number, since it uses as much as digits as its factorization.

40447072381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150528, while the sum is 40.

The spelling of 40447072381 in words is "forty billion, four hundred forty-seven million, seventy-two thousand, three hundred eighty-one".