3973646 has 4 divisors (see below), whose sum is σ = 5960472. Its totient is φ = 1986822.

The previous prime is 3973639. The next prime is 3973649. The reversal of 3973646 is 6463793.

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: 6463793 = 7 ⋅923399.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3973649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993410 + ... + 993413.

It is an arithmetic number, because the mean of its divisors is an integer number (1490118).

Almost surely, 2^3973646 is an apocalyptic number.

3973646 is a deficient number, since it is larger than the sum of its proper divisors (1986826).

3973646 is a wasteful number, since it uses less digits than its factorization.

3973646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1986825.

The product of its digits is 81648, while the sum is 38.

The square root of 3973646 is about 1993.4006120196. The cubic root of 3973646 is about 158.3907170273.

The spelling of 3973646 in words is "three million, nine hundred seventy-three thousand, six hundred forty-six".