987390989 has 16 divisors (see below), whose sum is σ = 1115275392. Its totient is φ = 867332928.

The previous prime is 987390973. The next prime is 987391021. The reversal of 987390989 is 989093789.

987390989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 987390989 - 2⁴ = 987390973 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 (987390959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50522 + ... + 67284.

It is an arithmetic number, because the mean of its divisors is an integer number (69704712).

Almost surely, 2^987390989 is an apocalyptic number.

It is an amenable number.

987390989 is a deficient number, since it is larger than the sum of its proper divisors (127884403).

987390989 is a wasteful number, since it uses less digits than its factorization.

987390989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16996.

The product of its (nonzero) digits is 8817984, while the sum is 62.

The square root of 987390989 is about 31422.7781871686. The cubic root of 987390989 is about 995.7792062985.

The spelling of 987390989 in words is "nine hundred eighty-seven million, three hundred ninety thousand, nine hundred eighty-nine".