56398987 has 2 divisors, whose sum is σ = 56398988. Its totient is φ = 56398986.

The previous prime is 56398963. The next prime is 56398999. The reversal of 56398987 is 78989365.

It is a happy number.

56398987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56398987 is a prime.

It is not a weakly prime, because it can be changed into another prime (56398487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28199493 + 28199494.

It is an arithmetic number, because the mean of its divisors is an integer number (28199494).

Almost surely, 2^56398987 is an apocalyptic number.

56398987 is a deficient number, since it is larger than the sum of its proper divisors (1).

56398987 is an equidigital number, since it uses as much as digits as its factorization.

56398987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 55.

The square root of 56398987 is about 7509.9258984360. The cubic root of 56398987 is about 383.4926998775.

The spelling of 56398987 in words is "fifty-six million, three hundred ninety-eight thousand, nine hundred eighty-seven".