109905987 has 8 divisors (see below), whose sum is σ = 147660480. Its totient is φ = 72711080.

The previous prime is 109905959. The next prime is 109905989. The reversal of 109905987 is 789509901.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 109905987 - 2¹⁴ = 109889603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (109905989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139437 + ... + 140222.

It is an arithmetic number, because the mean of its divisors is an integer number (18457560).

Almost surely, 2^109905987 is an apocalyptic number.

109905987 is a deficient number, since it is larger than the sum of its proper divisors (37754493).

109905987 is a wasteful number, since it uses less digits than its factorization.

109905987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279793.

The product of its (nonzero) digits is 204120, while the sum is 48.

The square root of 109905987 is about 10483.6056297440. The cubic root of 109905987 is about 479.0054450562.

The spelling of 109905987 in words is "one hundred nine million, nine hundred five thousand, nine hundred eighty-seven".