987779 has 4 divisors (see below), whose sum is σ = 1063776. Its totient is φ = 911784.

The previous prime is 987739. The next prime is 987793. The reversal of 987779 is 977789.

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 987779 - 2⁸ = 987523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (987739) 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, 37979 + ... + 38004.

It is an arithmetic number, because the mean of its divisors is an integer number (265944).

2⁹⁸⁷⁷⁷⁹ is an apocalyptic number.

987779 is a deficient number, since it is larger than the sum of its proper divisors (75997).

987779 is a wasteful number, since it uses less digits than its factorization.

987779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75996.

The product of its digits is 222264, while the sum is 47.

The square root of 987779 is about 993.8707159384. The cubic root of 987779 is about 99.5909624978.

The spelling of 987779 in words is "nine hundred eighty-seven thousand, seven hundred seventy-nine".