40406687 has 2 divisors, whose sum is σ = 40406688. Its totient is φ = 40406686.

The previous prime is 40406677. The next prime is 40406747. The reversal of 40406687 is 78660404.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40406687 - 2¹⁶ = 40341151 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40406647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20203343 + 20203344.

It is an arithmetic number, because the mean of its divisors is an integer number (20203344).

Almost surely, 2^40406687 is an apocalyptic number.

40406687 is a deficient number, since it is larger than the sum of its proper divisors (1).

40406687 is an equidigital number, since it uses as much as digits as its factorization.

40406687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 40406687 is about 6356.6254412227. The cubic root of 40406687 is about 343.1503249601.

The spelling of 40406687 in words is "forty million, four hundred six thousand, six hundred eighty-seven".