3921521476 has 6 divisors (see below), whose sum is σ = 6862662590. Its totient is φ = 1960760736.

The previous prime is 3921521441. The next prime is 3921521497. The reversal of 3921521476 is 6741251293.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 3766767876 + 154753600 = 61374^2 + 12440^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490190181 + ... + 490190188.

Almost surely, 2^3921521476 is an apocalyptic number.

It is an amenable number.

3921521476 is a deficient number, since it is larger than the sum of its proper divisors (2941141114).

3921521476 is a wasteful number, since it uses less digits than its factorization.

3921521476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 980380373 (or 980380371 counting only the distinct ones).

The product of its digits is 90720, while the sum is 40.

The square root of 3921521476 is about 62622.0526332378. The cubic root of 3921521476 is about 1576.9510013678.

The spelling of 3921521476 in words is "three billion, nine hundred twenty-one million, five hundred twenty-one thousand, four hundred seventy-six".