1897788428 has 12 divisors (see below), whose sum is σ = 3324556872. Its totient is φ = 947915040.

The previous prime is 1897788401. The next prime is 1897788463. The reversal of 1897788428 is 8248877981.

It is a super-2 number, since 2×1897788428² = 7203201834901422368, which contains 22 as substring.

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, 240425 + ... + 248192.

It is an arithmetic number, because the mean of its divisors is an integer number (277046406).

Almost surely, 2^1897788428 is an apocalyptic number.

It is an amenable number.

1897788428 is a deficient number, since it is larger than the sum of its proper divisors (1426768444).

1897788428 is a wasteful number, since it uses less digits than its factorization.

1897788428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489592 (or 489590 counting only the distinct ones).

The product of its digits is 14450688, while the sum is 62.

The square root of 1897788428 is about 43563.6135783064. The cubic root of 1897788428 is about 1238.0815869564.

The spelling of 1897788428 in words is "one billion, eight hundred ninety-seven million, seven hundred eighty-eight thousand, four hundred twenty-eight".