6215987 has 2 divisors, whose sum is σ = 6215988. Its totient is φ = 6215986.

The previous prime is 6215971. The next prime is 6216011. The reversal of 6215987 is 7895126.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6215987 - 2⁴ = 6215971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6215987.

It is not a weakly prime, because it can be changed into another prime (6215917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3107993 + 3107994.

It is an arithmetic number, because the mean of its divisors is an integer number (3107994).

Almost surely, 2^6215987 is an apocalyptic number.

6215987 is a deficient number, since it is larger than the sum of its proper divisors (1).

6215987 is an equidigital number, since it uses as much as digits as its factorization.

6215987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 38.

The square root of 6215987 is about 2493.1881196572. The cubic root of 6215987 is about 183.8668203730.

The spelling of 6215987 in words is "six million, two hundred fifteen thousand, nine hundred eighty-seven".