4399947 has 16 divisors (see below), whose sum is σ = 6583680. Its totient is φ = 2903976.

The previous prime is 4399943. The next prime is 4399961. The reversal of 4399947 is 7499934.

Added to its reverse (7499934) it gives a triangular number (11899881 = T₄₈₇₈).

It is not a de Polignac number, because 4399947 - 2² = 4399943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4399943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2128 + ... + 3650.

It is an arithmetic number, because the mean of its divisors is an integer number (411480).

Almost surely, 2^4399947 is an apocalyptic number.

4399947 is a deficient number, since it is larger than the sum of its proper divisors (2183733).

4399947 is a wasteful number, since it uses less digits than its factorization.

4399947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1639 (or 1633 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 4399947 is about 2097.6050629230. The cubic root of 4399947 is about 163.8635961777.

Adding to 4399947 its reverse (7499934), we get a triangular number (11899881 = T₄₈₇₈).

The spelling of 4399947 in words is "four million, three hundred ninety-nine thousand, nine hundred forty-seven".