40861987 has 2 divisors, whose sum is σ = 40861988. Its totient is φ = 40861986.

The previous prime is 40861943. The next prime is 40862021. The reversal of 40861987 is 78916804.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40861987 - 2⁷ = 40861859 is a prime.

It is not a weakly prime, because it can be changed into another prime (40861927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20430993 + 20430994.

It is an arithmetic number, because the mean of its divisors is an integer number (20430994).

Almost surely, 2^40861987 is an apocalyptic number.

40861987 is a deficient number, since it is larger than the sum of its proper divisors (1).

40861987 is an equidigital number, since it uses as much as digits as its factorization.

40861987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 40861987 is about 6392.3381481270. The cubic root of 40861987 is about 344.4343794916.

The spelling of 40861987 in words is "forty million, eight hundred sixty-one thousand, nine hundred eighty-seven".