1989774145 has 16 divisors (see below), whose sum is σ = 2514882240. Its totient is φ = 1507149504.

The previous prime is 1989774133. The next prime is 1989774167. The reversal of 1989774145 is 5414779891.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1989774145 - 2⁵ = 1989774113 is a prime.

It is a super-2 number, since 2×1989774145² = 7918402296220962050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187399 + ... + 197731.

It is an arithmetic number, because the mean of its divisors is an integer number (157180140).

Almost surely, 2^1989774145 is an apocalyptic number.

It is an amenable number.

1989774145 is a deficient number, since it is larger than the sum of its proper divisors (525108095).

1989774145 is a wasteful number, since it uses less digits than its factorization.

1989774145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12384.

The product of its digits is 2540160, while the sum is 55.

The square root of 1989774145 is about 44606.8845022828. The cubic root of 1989774145 is about 1257.7700848148.

The spelling of 1989774145 in words is "one billion, nine hundred eighty-nine million, seven hundred seventy-four thousand, one hundred forty-five".