1897445640484 has 27 divisors (see below), whose sum is σ = 3338264337681. Its totient is φ = 943682628240.

The previous prime is 1897445640451. The next prime is 1897445640499. The reversal of 1897445640484 is 4840465447981.

The square root of 1897445640484 is 1377478.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 375183200484 + 1522262440000 = 612522^2 + 1233800^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 548234514 + ... + 548237974.

Almost surely, 2^{1897445640484} is an apocalyptic number.

1897445640484 is the 1377478-th square number.

It is an amenable number.

1897445640484 is a deficient number, since it is larger than the sum of its proper divisors (1440818697197).

1897445640484 is an frugal number, since it uses more digits than its factorization.

1897445640484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7324 (or 3662 counting only the distinct ones).

The product of its (nonzero) digits is 123863040, while the sum is 64.

Multiplying 1897445640484 by its sum of digits (64), we get a square (121436520990976 = 11019824²).

The spelling of 1897445640484 in words is "one trillion, eight hundred ninety-seven billion, four hundred forty-five million, six hundred forty thousand, four hundred eighty-four".