3988969 has 2 divisors, whose sum is σ = 3988970. Its totient is φ = 3988968.

The previous prime is 3988961. The next prime is 3988991. The reversal of 3988969 is 9698893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3515625 + 473344 = 1875^2 + 688^2 .

It is a cyclic number.

It is not a de Polignac number, because 3988969 - 2³ = 3988961 is a prime.

It is a super-2 number, since 2×3988969² = 31823747365922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3988961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1994484 + 1994485.

It is an arithmetic number, because the mean of its divisors is an integer number (1994485).

Almost surely, 2^3988969 is an apocalyptic number.

It is an amenable number.

3988969 is a deficient number, since it is larger than the sum of its proper divisors (1).

3988969 is an equidigital number, since it uses as much as digits as its factorization.

3988969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 52.

The square root of 3988969 is about 1997.2403460776. The cubic root of 3988969 is about 158.5940490106.

The spelling of 3988969 in words is "three million, nine hundred eighty-eight thousand, nine hundred sixty-nine".