3973815 has 24 divisors (see below), whose sum is σ = 6935760. Its totient is φ = 2104704.

The previous prime is 3973811. The next prime is 3973829. The reversal of 3973815 is 5183793.

It is not a de Polignac number, because 3973815 - 2² = 3973811 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3973815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3973811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10296 + ... + 10674.

It is an arithmetic number, because the mean of its divisors is an integer number (288990).

Almost surely, 2^3973815 is an apocalyptic number.

3973815 is a deficient number, since it is larger than the sum of its proper divisors (2961945).

3973815 is a wasteful number, since it uses less digits than its factorization.

3973815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623 (or 620 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 3973815 is about 1993.4430014425. The cubic root of 3973815 is about 158.3929624590.

It can be divided in two parts, 397381 and 5, that added together give a triangular number (397386 = T₈₉₁).

The spelling of 3973815 in words is "three million, nine hundred seventy-three thousand, eight hundred fifteen".