3998247 has 16 divisors (see below), whose sum is σ = 6158592. Its totient is φ = 2280320.

The previous prime is 3998233. The next prime is 3998249. The reversal of 3998247 is 7428993.

It is a cyclic number.

It is not a de Polignac number, because 3998247 - 2⁷ = 3998119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3998199 and 3998208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3998249) 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, 3003 + ... + 4124.

It is an arithmetic number, because the mean of its divisors is an integer number (384912).

Almost surely, 2^3998247 is an apocalyptic number.

3998247 is a deficient number, since it is larger than the sum of its proper divisors (2160345).

3998247 is a wasteful number, since it uses less digits than its factorization.

3998247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7158.

The product of its digits is 108864, while the sum is 42.

The square root of 3998247 is about 1999.5617019737. The cubic root of 3998247 is about 158.7169125247.

It can be divided in two parts, 399 and 8247, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 3998247 in words is "three million, nine hundred ninety-eight thousand, two hundred forty-seven".