3998969 has 8 divisors (see below), whose sum is σ = 4445952. Its totient is φ = 3571920.

The previous prime is 3998959. The next prime is 3998971. The reversal of 3998969 is 9698993.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3998969 - 2²⁰ = 2950393 is a prime.

It is a super-2 number, since 2×3998969² = 31983506125922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3998969.

It is not an unprimeable number, because it can be changed into a prime (3998959) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4559 + ... + 5364.

It is an arithmetic number, because the mean of its divisors is an integer number (555744).

Almost surely, 2^3998969 is an apocalyptic number.

It is an amenable number.

3998969 is a deficient number, since it is larger than the sum of its proper divisors (446983).

3998969 is a wasteful number, since it uses less digits than its factorization.

3998969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9967.

The product of its digits is 944784, while the sum is 53.

The square root of 3998969 is about 1999.7422333891. The cubic root of 3998969 is about 158.7264656042.

The spelling of 3998969 in words is "three million, nine hundred ninety-eight thousand, nine hundred sixty-nine".