1897905728 has 28 divisors (see below), whose sum is σ = 3767911692. Its totient is φ = 948510720.

The previous prime is 1897905677. The next prime is 1897905733. The reversal of 1897905728 is 8275097981.

It can be written as a sum of positive squares in 2 ways, for example, as 507510784 + 1390394944 = 22528^2 + 37288^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164468 + ... + 175628.

Almost surely, 2^1897905728 is an apocalyptic number.

It is an amenable number.

1897905728 is a deficient number, since it is larger than the sum of its proper divisors (1870005964).

1897905728 is a wasteful number, since it uses less digits than its factorization.

1897905728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13830 (or 13820 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 56.

The square root of 1897905728 is about 43564.9598645517. The cubic root of 1897905728 is about 1238.1070945377.

The spelling of 1897905728 in words is "one billion, eight hundred ninety-seven million, nine hundred five thousand, seven hundred twenty-eight".