3897986 has 4 divisors (see below), whose sum is σ = 5846982. Its totient is φ = 1948992.

The previous prime is 3897973. The next prime is 3898001. The reversal of 3897986 is 6897983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6897983 = 307 ⋅22469.

It can be written as a sum of positive squares in only one way, i.e., 3876961 + 21025 = 1969^2 + 145^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974495 + ... + 974498.

Almost surely, 2^3897986 is an apocalyptic number.

3897986 is a deficient number, since it is larger than the sum of its proper divisors (1948996).

3897986 is a wasteful number, since it uses less digits than its factorization.

3897986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1948995.

The product of its digits is 653184, while the sum is 50.

The square root of 3897986 is about 1974.3317856936. The cubic root of 3897986 is about 157.3789916243.

The spelling of 3897986 in words is "three million, eight hundred ninety-seven thousand, nine hundred eighty-six".