3902452821 has 6 divisors (see below), whose sum is σ = 5636876310. Its totient is φ = 2601635208.

The previous prime is 3902452783. The next prime is 3902452837. The reversal of 3902452821 is 1282542093.

It is a happy number.

3902452821 is a `hidden beast` number, since 3 + 90 + 24 + 528 + 21 = 666.

3902452821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2026350225 + 1876102596 = 45015^2 + 43314^2 .

It is not a de Polignac number, because 3902452821 - 2¹³ = 3902444629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3902452861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 216802926 + ... + 216802943.

It is an arithmetic number, because the mean of its divisors is an integer number (939479385).

Almost surely, 2^3902452821 is an apocalyptic number.

It is an amenable number.

3902452821 is a deficient number, since it is larger than the sum of its proper divisors (1734423489).

3902452821 is a wasteful number, since it uses less digits than its factorization.

3902452821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433605875 (or 433605872 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 3902452821 is about 62469.6151821027. The cubic root of 3902452821 is about 1574.3908380457.

The spelling of 3902452821 in words is "three billion, nine hundred two million, four hundred fifty-two thousand, eight hundred twenty-one".