3921028693 has 2 divisors, whose sum is σ = 3921028694. Its totient is φ = 3921028692.

The previous prime is 3921028687. The next prime is 3921028819. The reversal of 3921028693 is 3968201293.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3836811364 + 84217329 = 61942^2 + 9177^2 .

It is a cyclic number.

It is not a de Polignac number, because 3921028693 - 2¹³ = 3921020501 is a prime.

It is a super-2 number, since 2×3921028693² = 30748932022658576498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3921028673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1960514346 + 1960514347.

It is an arithmetic number, because the mean of its divisors is an integer number (1960514347).

Almost surely, 2^3921028693 is an apocalyptic number.

It is an amenable number.

3921028693 is a deficient number, since it is larger than the sum of its proper divisors (1).

3921028693 is an equidigital number, since it uses as much as digits as its factorization.

3921028693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 3921028693 is about 62618.1179292383. The cubic root of 3921028693 is about 1576.8849447617.

The spelling of 3921028693 in words is "three billion, nine hundred twenty-one million, twenty-eight thousand, six hundred ninety-three".