40697887 has 2 divisors, whose sum is σ = 40697888. Its totient is φ = 40697886.

The previous prime is 40697869. The next prime is 40697897. The reversal of 40697887 is 78879604.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40697887 - 2²³ = 32309279 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40697887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40697837) 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 as a sum of consecutive naturals, namely, 20348943 + 20348944.

It is an arithmetic number, because the mean of its divisors is an integer number (20348944).

Almost surely, 2^40697887 is an apocalyptic number.

40697887 is a deficient number, since it is larger than the sum of its proper divisors (1).

40697887 is an equidigital number, since it uses as much as digits as its factorization.

40697887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 49.

The square root of 40697887 is about 6379.4895563830. The cubic root of 40697887 is about 343.9726829534.

The spelling of 40697887 in words is "forty million, six hundred ninety-seven thousand, eight hundred eighty-seven".