1897680221 has 8 divisors (see below), whose sum is σ = 2026444800. Its totient is φ = 1773137520.

The previous prime is 1897680209. The next prime is 1897680227. The reversal of 1897680221 is 1220867981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1897680221 - 2¹⁰ = 1897679197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1897680227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1054541 + ... + 1056338.

It is an arithmetic number, because the mean of its divisors is an integer number (253305600).

Almost surely, 2^1897680221 is an apocalyptic number.

It is an amenable number.

1897680221 is a deficient number, since it is larger than the sum of its proper divisors (128764579).

1897680221 is a wasteful number, since it uses less digits than its factorization.

1897680221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110939.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 1897680221 is about 43562.3716181752. The cubic root of 1897680221 is about 1238.0580557698.

The spelling of 1897680221 in words is "one billion, eight hundred ninety-seven million, six hundred eighty thousand, two hundred twenty-one".