3780921 has 8 divisors (see below), whose sum is σ = 5050240. Its totient is φ = 2516112.

The previous prime is 3780893. The next prime is 3780929. The reversal of 3780921 is 1290873.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3780921 - 2⁶ = 3780857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3780929) 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, 2511 + ... + 3723.

It is an arithmetic number, because the mean of its divisors is an integer number (631280).

Almost surely, 2^3780921 is an apocalyptic number.

It is an amenable number.

3780921 is a deficient number, since it is larger than the sum of its proper divisors (1269319).

3780921 is a wasteful number, since it uses less digits than its factorization.

3780921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2255.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 3780921 is about 1944.4590507388. The cubic root of 3780921 is about 155.7874735812.

The spelling of 3780921 in words is "three million, seven hundred eighty thousand, nine hundred twenty-one".