1987769698 has 4 divisors (see below), whose sum is σ = 2981654550. Its totient is φ = 993884848.

The previous prime is 1987769681. The next prime is 1987769701. The reversal of 1987769698 is 8969677891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1262167729 + 725601969 = 35527^2 + 26937^2 .

It is a super-2 number, since 2×1987769698² = 7902456744574022408, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496942423 + ... + 496942426.

Almost surely, 2^1987769698 is an apocalyptic number.

1987769698 is a deficient number, since it is larger than the sum of its proper divisors (993884852).

1987769698 is an equidigital number, since it uses as much as digits as its factorization.

1987769698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993884851.

The product of its digits is 82301184, while the sum is 70.

The square root of 1987769698 is about 44584.4109302792. The cubic root of 1987769698 is about 1257.3475945658.

The spelling of 1987769698 in words is "one billion, nine hundred eighty-seven million, seven hundred sixty-nine thousand, six hundred ninety-eight".