4399987 has 2 divisors, whose sum is σ = 4399988. Its totient is φ = 4399986.

The previous prime is 4399973. The next prime is 4400021. The reversal of 4399987 is 7899934.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 4399987 - 2¹⁵ = 4367219 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 4399987.

It is not a weakly prime, because it can be changed into another prime (4399907) 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, 2199993 + 2199994.

It is an arithmetic number, because the mean of its divisors is an integer number (2199994).

Almost surely, 2^4399987 is an apocalyptic number.

4399987 is a deficient number, since it is larger than the sum of its proper divisors (1).

4399987 is an equidigital number, since it uses as much as digits as its factorization.

4399987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 49.

The square root of 4399987 is about 2097.6145975846. The cubic root of 4399987 is about 163.8640927385.

The spelling of 4399987 in words is "four million, three hundred ninety-nine thousand, nine hundred eighty-seven".