3997894 has 4 divisors (see below), whose sum is σ = 5996844. Its totient is φ = 1998946.

The previous prime is 3997891. The next prime is 3997897. The reversal of 3997894 is 4987993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4987993 = 31 ⋅160903.

It is an interprime number because it is at equal distance from previous prime (3997891) and next prime (3997897).

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3997891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999472 + ... + 999475.

It is an arithmetic number, because the mean of its divisors is an integer number (1499211).

Almost surely, 2^3997894 is an apocalyptic number.

3997894 is a deficient number, since it is larger than the sum of its proper divisors (1998950).

3997894 is a wasteful number, since it uses less digits than its factorization.

3997894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1998949.

The product of its digits is 489888, while the sum is 49.

The square root of 3997894 is about 1999.4734306812. The cubic root of 3997894 is about 158.7122414177.

Subtracting 3997894 from its reverse (4987993), we obtain a palindrome (990099).

The spelling of 3997894 in words is "three million, nine hundred ninety-seven thousand, eight hundred ninety-four".