1897223100 has 72 divisors (see below), whose sum is σ = 5637691248. Its totient is φ = 492249600.

The previous prime is 1897223077. The next prime is 1897223101. The reversal of 1897223100 is 13227981.

It is a super-2 number, since 2×1897223100² = 7198910982347220000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1897223101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74361 + ... + 96560.

Almost surely, 2^1897223100 is an apocalyptic number.

1897223100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1897223100 is an abundant number, since it is smaller than the sum of its proper divisors (3740468148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1897223100 is a wasteful number, since it uses less digits than its factorization.

1897223100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170975 (or 170968 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 1897223100 is about 43557.1245607421. The cubic root of 1897223100 is about 1237.9586382848.

The spelling of 1897223100 in words is "one billion, eight hundred ninety-seven million, two hundred twenty-three thousand, one hundred".