1897921828 has 24 divisors (see below), whose sum is σ = 3649764384. Its totient is φ = 856392000.

The previous prime is 1897921813. The next prime is 1897921841. The reversal of 1897921828 is 8281297981.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151398 + ... + 163453.

It is an arithmetic number, because the mean of its divisors is an integer number (152073516).

Almost surely, 2^1897921828 is an apocalyptic number.

It is an amenable number.

1897921828 is a deficient number, since it is larger than the sum of its proper divisors (1751842556).

1897921828 is a wasteful number, since it uses less digits than its factorization.

1897921828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315003 (or 315001 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 55.

The square root of 1897921828 is about 43565.1446456912. The cubic root of 1897921828 is about 1238.1105954963.

The spelling of 1897921828 in words is "one billion, eight hundred ninety-seven million, nine hundred twenty-one thousand, eight hundred twenty-eight".