3788756221 has 16 divisors (see below), whose sum is σ = 4065102720. Its totient is φ = 3518668800.

The previous prime is 3788756219. The next prime is 3788756239. The reversal of 3788756221 is 1226578873.

It is a cyclic number.

It is not a de Polignac number, because 3788756221 - 2¹ = 3788756219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3788756201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 389821 + ... + 399421.

It is an arithmetic number, because the mean of its divisors is an integer number (254068920).

Almost surely, 2^3788756221 is an apocalyptic number.

It is an amenable number.

3788756221 is a deficient number, since it is larger than the sum of its proper divisors (276346499).

3788756221 is a wasteful number, since it uses less digits than its factorization.

3788756221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9924.

The product of its digits is 1128960, while the sum is 49.

The square root of 3788756221 is about 61552.8733772843. The cubic root of 3788756221 is about 1558.9501237773.

The spelling of 3788756221 in words is "three billion, seven hundred eighty-eight million, seven hundred fifty-six thousand, two hundred twenty-one".