3978466 has 4 divisors (see below), whose sum is σ = 5967702. Its totient is φ = 1989232.

The previous prime is 3978451. The next prime is 3978473. The reversal of 3978466 is 6648793.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6648793 = 157 ⋅42349.

It can be written as a sum of positive squares in only one way, i.e., 3900625 + 77841 = 1975^2 + 279^2 .

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994615 + ... + 994618.

Almost surely, 2^3978466 is an apocalyptic number.

3978466 is a deficient number, since it is larger than the sum of its proper divisors (1989236).

3978466 is a wasteful number, since it uses less digits than its factorization.

3978466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1989235.

The product of its digits is 217728, while the sum is 43.

The square root of 3978466 is about 1994.6092349129. The cubic root of 3978466 is about 158.4547333640.

It can be divided in two parts, 3978 and 466, that added together give a palindrome (4444).

The spelling of 3978466 in words is "three million, nine hundred seventy-eight thousand, four hundred sixty-six".