40945381 has 4 divisors (see below), whose sum is σ = 41052672. Its totient is φ = 40838092.

The previous prime is 40945363. The next prime is 40945393. The reversal of 40945381 is 18354904.

40945381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40945381 - 2¹⁹ = 40421093 is a prime.

It is a super-2 number, since 2×40945381² = 3353048450470322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40945321) 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 in 3 ways as a sum of consecutive naturals, for example, 53071 + ... + 53836.

It is an arithmetic number, because the mean of its divisors is an integer number (10263168).

Almost surely, 2^40945381 is an apocalyptic number.

It is an amenable number.

40945381 is a deficient number, since it is larger than the sum of its proper divisors (107291).

40945381 is a wasteful number, since it uses less digits than its factorization.

40945381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107290.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 40945381 is about 6398.8577886995. The cubic root of 40945381 is about 344.6685355242.

The spelling of 40945381 in words is "forty million, nine hundred forty-five thousand, three hundred eighty-one".