40663687 has 2 divisors, whose sum is σ = 40663688. Its totient is φ = 40663686.

The previous prime is 40663673. The next prime is 40663751. The reversal of 40663687 is 78636604.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40663687 - 2⁷ = 40663559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40663627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20331843 + 20331844.

It is an arithmetic number, because the mean of its divisors is an integer number (20331844).

Almost surely, 2^40663687 is an apocalyptic number.

40663687 is a deficient number, since it is larger than the sum of its proper divisors (1).

40663687 is an equidigital number, since it uses as much as digits as its factorization.

40663687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 40663687 is about 6376.8085277825. The cubic root of 40663687 is about 343.8763047925.

The spelling of 40663687 in words is "forty million, six hundred sixty-three thousand, six hundred eighty-seven".