1988789445 has 12 divisors (see below), whose sum is σ = 3447235116. Its totient is φ = 1060687680.

The previous prime is 1988789401. The next prime is 1988789513. The reversal of 1988789445 is 5449878891.

It can be written as a sum of positive squares in 2 ways, for example, as 1411204356 + 577585089 = 37566^2 + 24033^2 .

It is not a de Polignac number, because 1988789445 - 2⁷ = 1988789317 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22097616 + ... + 22097705.

It is an arithmetic number, because the mean of its divisors is an integer number (287269593).

Almost surely, 2^1988789445 is an apocalyptic number.

1988789445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1988789445 is a deficient number, since it is larger than the sum of its proper divisors (1458445671).

1988789445 is a wasteful number, since it uses less digits than its factorization.

1988789445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44195332 (or 44195329 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 63.

The square root of 1988789445 is about 44595.8456024774. The cubic root of 1988789445 is about 1257.5625687057.

The spelling of 1988789445 in words is "one billion, nine hundred eighty-eight million, seven hundred eighty-nine thousand, four hundred forty-five".