1984910987 has 4 divisors (see below), whose sum is σ = 1985571480. Its totient is φ = 1984250496.

The previous prime is 1984910959. The next prime is 1984911029. The reversal of 1984910987 is 7890194891.

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

It is a cyclic number.

It is not a de Polignac number, because 1984910987 - 2¹⁰ = 1984909963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1984910087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325718 + ... + 331755.

It is an arithmetic number, because the mean of its divisors is an integer number (496392870).

Almost surely, 2^1984910987 is an apocalyptic number.

1984910987 is a deficient number, since it is larger than the sum of its proper divisors (660493).

1984910987 is an equidigital number, since it uses as much as digits as its factorization.

1984910987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660492.

The product of its (nonzero) digits is 1306368, while the sum is 56.

The square root of 1984910987 is about 44552.3398599894. The cubic root of 1984910987 is about 1256.7445539028.

The spelling of 1984910987 in words is "one billion, nine hundred eighty-four million, nine hundred ten thousand, nine hundred eighty-seven".