40603681 has 2 divisors, whose sum is σ = 40603682. Its totient is φ = 40603680.

The previous prime is 40603663. The next prime is 40603727. The reversal of 40603681 is 18630604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39125025 + 1478656 = 6255^2 + 1216^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40603681 is a prime.

It is a super-2 number, since 2×40603681² = 3297317821499522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40603601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20301840 + 20301841.

It is an arithmetic number, because the mean of its divisors is an integer number (20301841).

Almost surely, 2^40603681 is an apocalyptic number.

It is an amenable number.

40603681 is a deficient number, since it is larger than the sum of its proper divisors (1).

40603681 is an equidigital number, since it uses as much as digits as its factorization.

40603681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 40603681 is about 6372.1017725708. The cubic root of 40603681 is about 343.7070727221.

The spelling of 40603681 in words is "forty million, six hundred three thousand, six hundred eighty-one".