40454681 has 4 divisors (see below), whose sum is σ = 41849700. Its totient is φ = 39059664.

The previous prime is 40454671. The next prime is 40454719. The reversal of 40454681 is 18645404.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17977600 + 22477081 = 4240^2 + 4741^2 .

It is a cyclic number.

It is not a de Polignac number, because 40454681 - 2²² = 36260377 is a prime.

It is a super-2 number, since 2×40454681² = 3273162429623522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40454671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 697466 + ... + 697523.

It is an arithmetic number, because the mean of its divisors is an integer number (10462425).

Almost surely, 2^40454681 is an apocalyptic number.

It is an amenable number.

40454681 is a deficient number, since it is larger than the sum of its proper divisors (1395019).

40454681 is a wasteful number, since it uses less digits than its factorization.

40454681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395018.

The product of its (nonzero) digits is 15360, while the sum is 32.

The square root of 40454681 is about 6360.3994371423. The cubic root of 40454681 is about 343.2861328479.

The spelling of 40454681 in words is "forty million, four hundred fifty-four thousand, six hundred eighty-one".