3973990 has 16 divisors (see below), whose sum is σ = 7175952. Its totient is φ = 1584544.

The previous prime is 3973973. The next prime is 3973997. The reversal of 3973990 is 993793.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3973997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5532 + ... + 6208.

It is an arithmetic number, because the mean of its divisors is an integer number (448497).

Almost surely, 2^3973990 is an apocalyptic number.

3973990 is a deficient number, since it is larger than the sum of its proper divisors (3201962).

3973990 is a wasteful number, since it uses less digits than its factorization.

3973990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1271.

The product of its (nonzero) digits is 45927, while the sum is 40.

The square root of 3973990 is about 1993.4868948654. The cubic root of 3973990 is about 158.3952875430.

The spelling of 3973990 in words is "three million, nine hundred seventy-three thousand, nine hundred ninety".