3802921 has 4 divisors (see below), whose sum is σ = 3807700. Its totient is φ = 3798144.

The previous prime is 3802919. The next prime is 3802949. The reversal of 3802921 is 1292083.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1292083 = 13 ⋅99391.

It can be written as a sum of positive squares in 2 ways, for example, as 2205225 + 1597696 = 1485^2 + 1264^2 .

It is a cyclic number.

It is not a de Polignac number, because 3802921 - 2¹ = 3802919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3802961) 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, 876 + ... + 2893.

It is an arithmetic number, because the mean of its divisors is an integer number (951925).

Almost surely, 2^3802921 is an apocalyptic number.

It is an amenable number.

3802921 is a deficient number, since it is larger than the sum of its proper divisors (4779).

3802921 is a wasteful number, since it uses less digits than its factorization.

3802921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4778.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 3802921 is about 1950.1079457302. The cubic root of 3802921 is about 156.0890489835.

The spelling of 3802921 in words is "three million, eight hundred two thousand, nine hundred twenty-one".