3921697 has 4 divisors (see below), whose sum is σ = 4223380. Its totient is φ = 3620016.

The previous prime is 3921689. The next prime is 3921719. The reversal of 3921697 is 7961293.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7961293 = 61 ⋅130513.

It can be written as a sum of positive squares in 2 ways, for example, as 1018081 + 2903616 = 1009^2 + 1704^2 .

It is a cyclic number.

It is not a de Polignac number, because 3921697 - 2³ = 3921689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3921637) 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 3 ways as a sum of consecutive naturals, for example, 150822 + ... + 150847.

It is an arithmetic number, because the mean of its divisors is an integer number (1055845).

Almost surely, 2^3921697 is an apocalyptic number.

It is an amenable number.

3921697 is a deficient number, since it is larger than the sum of its proper divisors (301683).

3921697 is a wasteful number, since it uses less digits than its factorization.

3921697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301682.

The product of its digits is 20412, while the sum is 37.

The square root of 3921697 is about 1980.3274981679. The cubic root of 3921697 is about 157.6974528683.

It can be divided in two parts, 39 and 21697, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 3921697 in words is "three million, nine hundred twenty-one thousand, six hundred ninety-seven".