3784920621 has 4 divisors (see below), whose sum is σ = 5046560832. Its totient is φ = 2523280412.

The previous prime is 3784920589. The next prime is 3784920679. The reversal of 3784920621 is 1260294873.

3784920621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 an emirpimes, since its reverse is a distinct semiprime: 1260294873 = 3 ⋅420098291.

It is a cyclic number.

It is not a de Polignac number, because 3784920621 - 2⁵ = 3784920589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3784920121) 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, 630820101 + ... + 630820106.

It is an arithmetic number, because the mean of its divisors is an integer number (1261640208).

Almost surely, 2^3784920621 is an apocalyptic number.

It is an amenable number.

3784920621 is a deficient number, since it is larger than the sum of its proper divisors (1261640211).

3784920621 is a wasteful number, since it uses less digits than its factorization.

3784920621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1261640210.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 3784920621 is about 61521.7085344677. The cubic root of 3784920621 is about 1558.4238712119.

The spelling of 3784920621 in words is "three billion, seven hundred eighty-four million, nine hundred twenty thousand, six hundred twenty-one".