3973820 has 24 divisors (see below), whose sum is σ = 8382528. Its totient is φ = 1582400.

The previous prime is 3973811. The next prime is 3973829. The reversal of 3973820 is 283793.

It is an interprime number because it is at equal distance from previous prime (3973811) and next prime (3973829).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3973829) 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, 8390 + ... + 8850.

It is an arithmetic number, because the mean of its divisors is an integer number (349272).

Almost surely, 2^3973820 is an apocalyptic number.

It is an amenable number.

3973820 is an abundant number, since it is smaller than the sum of its proper divisors (4408708).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3973820 is a wasteful number, since it uses less digits than its factorization.

3973820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901 (or 899 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 3973820 is about 1993.4442555537. Note that the first 3 decimals coincide. The cubic root of 3973820 is about 158.3930288909.

The spelling of 3973820 in words is "three million, nine hundred seventy-three thousand, eight hundred twenty".