40689487 has 2 divisors, whose sum is σ = 40689488. Its totient is φ = 40689486.

The previous prime is 40689437. The next prime is 40689491. The reversal of 40689487 is 78498604.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40689487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40689437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20344743 + 20344744.

It is an arithmetic number, because the mean of its divisors is an integer number (20344744).

Almost surely, 2^40689487 is an apocalyptic number.

40689487 is a deficient number, since it is larger than the sum of its proper divisors (1).

40689487 is an equidigital number, since it uses as much as digits as its factorization.

40689487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 40689487 is about 6378.8311625250. The cubic root of 40689487 is about 343.9490161281.

The spelling of 40689487 in words is "forty million, six hundred eighty-nine thousand, four hundred eighty-seven".