1928981087 has 4 divisors (see below), whose sum is σ = 2104343016. Its totient is φ = 1753619160.

The previous prime is 1928981069. The next prime is 1928981141. The reversal of 1928981087 is 7801898291.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7801898291 = 11 ⋅709263481.

It is a cyclic number.

It is not a de Polignac number, because 1928981087 - 2²⁸ = 1660545631 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 (1928981017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87680948 + ... + 87680969.

It is an arithmetic number, because the mean of its divisors is an integer number (526085754).

Almost surely, 2^1928981087 is an apocalyptic number.

1928981087 is a deficient number, since it is larger than the sum of its proper divisors (175361929).

1928981087 is a wasteful number, since it uses less digits than its factorization.

1928981087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175361928.

The product of its (nonzero) digits is 580608, while the sum is 53.

The square root of 1928981087 is about 43920.1672014122. The cubic root of 1928981087 is about 1244.8279278111.

The spelling of 1928981087 in words is "one billion, nine hundred twenty-eight million, nine hundred eighty-one thousand, eighty-seven".