1897768044 has 72 divisors (see below), whose sum is σ = 4997632640. Its totient is φ = 606528000.

The previous prime is 1897768039. The next prime is 1897768057. The reversal of 1897768044 is 4408677981.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 113844 + ... + 129444.

Almost surely, 2^1897768044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1897768044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2498816320).

1897768044 is an abundant number, since it is smaller than the sum of its proper divisors (3099864596).

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

1897768044 is a wasteful number, since it uses less digits than its factorization.

1897768044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15751 (or 15746 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 54.

The square root of 1897768044 is about 43563.3796209615. The cubic root of 1897768044 is about 1238.0771542274.

The spelling of 1897768044 in words is "one billion, eight hundred ninety-seven million, seven hundred sixty-eight thousand, forty-four".