3800921 has 4 divisors (see below), whose sum is σ = 3805200. Its totient is φ = 3796644.

The previous prime is 3800917. The next prime is 3800947. The reversal of 3800921 is 1290083.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3800921 - 2² = 3800917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3800021) 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, 251 + ... + 2768.

It is an arithmetic number, because the mean of its divisors is an integer number (951300).

Almost surely, 2^3800921 is an apocalyptic number.

It is an amenable number.

3800921 is a deficient number, since it is larger than the sum of its proper divisors (4279).

3800921 is a wasteful number, since it uses less digits than its factorization.

3800921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4278.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 3800921 is about 1949.5950861653. The cubic root of 3800921 is about 156.0616811750.

The spelling of 3800921 in words is "three million, eight hundred thousand, nine hundred twenty-one".