3936989 has 4 divisors (see below), whose sum is σ = 4499424. Its totient is φ = 3374556.

The previous prime is 3936973. The next prime is 3936997. The reversal of 3936989 is 9896393.

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, and also an emirpimes, since its reverse is a distinct semiprime: 9896393 = 13 ⋅761261.

It is a cyclic number.

It is not a de Polignac number, because 3936989 - 2⁴ = 3936973 is a prime.

It is a super-2 number, since 2×3936989² = 30999764772242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3936929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281207 + ... + 281220.

It is an arithmetic number, because the mean of its divisors is an integer number (1124856).

Almost surely, 2^3936989 is an apocalyptic number.

It is an amenable number.

3936989 is a deficient number, since it is larger than the sum of its proper divisors (562435).

3936989 is an equidigital number, since it uses as much as digits as its factorization.

3936989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562434.

The product of its digits is 314928, while the sum is 47.

The square root of 3936989 is about 1984.1847192235. The cubic root of 3936989 is about 157.9021586199.

The spelling of 3936989 in words is "three million, nine hundred thirty-six thousand, nine hundred eighty-nine".