3993973 has 4 divisors (see below), whose sum is σ = 4167648. Its totient is φ = 3820300.

The previous prime is 3993959. The next prime is 3993991. The reversal of 3993973 is 3793993.

It is a happy number.

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: 3793993 = 7 ⋅541999.

It is a de Polignac number, because none of the positive numbers 2^k-3993973 is a prime.

It is a Duffinian number.

3993973 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3993943) 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, 86803 + ... + 86848.

It is an arithmetic number, because the mean of its divisors is an integer number (1041912).

Almost surely, 2^3993973 is an apocalyptic number.

It is an amenable number.

3993973 is a deficient number, since it is larger than the sum of its proper divisors (173675).

3993973 is a wasteful number, since it uses less digits than its factorization.

3993973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173674.

The product of its digits is 137781, while the sum is 43.

The square root of 3993973 is about 1998.4926819981. The cubic root of 3993973 is about 158.6603379024.

The spelling of 3993973 in words is "three million, nine hundred ninety-three thousand, nine hundred seventy-three".