1989043815 has 32 divisors (see below), whose sum is σ = 3505522176. Its totient is φ = 955013760.

The previous prime is 1989043787. The next prime is 1989043829. The reversal of 1989043815 is 5183409891.

It is not a de Polignac number, because 1989043815 - 2⁷ = 1989043687 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41524 + ... + 75513.

It is an arithmetic number, because the mean of its divisors is an integer number (109547568).

Almost surely, 2^1989043815 is an apocalyptic number.

1989043815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1989043815 is a deficient number, since it is larger than the sum of its proper divisors (1516478361).

1989043815 is a wasteful number, since it uses less digits than its factorization.

1989043815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117159.

The product of its (nonzero) digits is 311040, while the sum is 48.

The square root of 1989043815 is about 44598.6974585581. The cubic root of 1989043815 is about 1257.6161813115.

The spelling of 1989043815 in words is "one billion, nine hundred eighty-nine million, forty-three thousand, eight hundred fifteen".