1988499069 has 12 divisors (see below), whose sum is σ = 2882649276. Its totient is φ = 1320878592.

The previous prime is 1988499047. The next prime is 1988499083. The reversal of 1988499069 is 9609948891.

1988499069 is a `hidden beast` number, since 1 + 9 + 88 + 499 + 0 + 69 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 986776569 + 1001722500 = 31413^2 + 31650^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1988499069 is a prime.

It is a super-2 number, since 2×1988499069² = 7908257094827733522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1988498997 and 1988499015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988499089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 396324 + ... + 401309.

It is an arithmetic number, because the mean of its divisors is an integer number (240220773).

Almost surely, 2^1988499069 is an apocalyptic number.

It is an amenable number.

1988499069 is a deficient number, since it is larger than the sum of its proper divisors (894150207).

1988499069 is a wasteful number, since it uses less digits than its factorization.

1988499069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797916 (or 797913 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 63.

The square root of 1988499069 is about 44592.5898440537. The cubic root of 1988499069 is about 1257.5013616629.

The spelling of 1988499069 in words is "one billion, nine hundred eighty-eight million, four hundred ninety-nine thousand, sixty-nine".