1987929898 has 4 divisors (see below), whose sum is σ = 2981894850. Its totient is φ = 993964948.

The previous prime is 1987929887. The next prime is 1987929913. The reversal of 1987929898 is 8989297891.

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., 1370258289 + 617671609 = 37017^2 + 24853^2 .

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, 496982473 + ... + 496982476.

Almost surely, 2^1987929898 is an apocalyptic number.

1987929898 is a deficient number, since it is larger than the sum of its proper divisors (993964952).

1987929898 is an equidigital number, since it uses as much as digits as its factorization.

1987929898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993964951.

The product of its digits is 47029248, while the sum is 70.

The square root of 1987929898 is about 44586.2074861722. The cubic root of 1987929898 is about 1257.3813713952.

The spelling of 1987929898 in words is "one billion, nine hundred eighty-seven million, nine hundred twenty-nine thousand, eight hundred ninety-eight".