3816627921 has 6 divisors (see below), whose sum is σ = 5512907010. Its totient is φ = 2544418608.

The previous prime is 3816627901. The next prime is 3816627937. The reversal of 3816627921 is 1297266183.

3816627921 is a `hidden beast` number, since 3 + 8 + 16 + 627 + 9 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2131114896 + 1685513025 = 46164^2 + 41055^2 .

It is a de Polignac number, because none of the positive numbers 2^k-3816627921 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3816627901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 212034876 + ... + 212034893.

It is an arithmetic number, because the mean of its divisors is an integer number (918817835).

Almost surely, 2^3816627921 is an apocalyptic number.

It is an amenable number.

3816627921 is a deficient number, since it is larger than the sum of its proper divisors (1696279089).

3816627921 is a wasteful number, since it uses less digits than its factorization.

3816627921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424069775 (or 424069772 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 3816627921 is about 61778.8630601114. The cubic root of 3816627921 is about 1562.7635543564.

The spelling of 3816627921 in words is "three billion, eight hundred sixteen million, six hundred twenty-seven thousand, nine hundred twenty-one".