4399861 has 4 divisors (see below), whose sum is σ = 4541824. Its totient is φ = 4257900.

The previous prime is 4399853. The next prime is 4399873. The reversal of 4399861 is 1689934.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4399861 - 2³ = 4399853 is a prime.

It is a Duffinian number.

4399861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4399061) 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 in 3 ways as a sum of consecutive naturals, for example, 70935 + ... + 70996.

It is an arithmetic number, because the mean of its divisors is an integer number (1135456).

Almost surely, 2^4399861 is an apocalyptic number.

It is an amenable number.

4399861 is a deficient number, since it is larger than the sum of its proper divisors (141963).

4399861 is a wasteful number, since it uses less digits than its factorization.

4399861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141962.

The product of its digits is 46656, while the sum is 40.

The square root of 4399861 is about 2097.5845632536. The cubic root of 4399861 is about 163.8625285617.

The spelling of 4399861 in words is "four million, three hundred ninety-nine thousand, eight hundred sixty-one".