987899783 has 4 divisors (see below), whose sum is σ = 1063892088. Its totient is φ = 911907480.

The previous prime is 987899779. The next prime is 987899821. The reversal of 987899783 is 387998789.

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 987899783 - 2² = 987899779 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987899743) 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, 37996133 + ... + 37996158.

It is an arithmetic number, because the mean of its divisors is an integer number (265973022).

Almost surely, 2^987899783 is an apocalyptic number.

987899783 is a deficient number, since it is larger than the sum of its proper divisors (75992305).

987899783 is a wasteful number, since it uses less digits than its factorization.

987899783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75992304.

The product of its digits is 54867456, while the sum is 68.

The square root of 987899783 is about 31430.8730868234. The cubic root of 987899783 is about 995.9502157205.

The spelling of 987899783 in words is "nine hundred eighty-seven million, eight hundred ninety-nine thousand, seven hundred eighty-three".