100438987 has 4 divisors (see below), whose sum is σ = 109569816. Its totient is φ = 91308160.

The previous prime is 100438981. The next prime is 100438991. The reversal of 100438987 is 789834001.

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 100438987 - 2¹⁵ = 100406219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100438981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4565398 + ... + 4565419.

It is an arithmetic number, because the mean of its divisors is an integer number (27392454).

Almost surely, 2^100438987 is an apocalyptic number.

100438987 is a deficient number, since it is larger than the sum of its proper divisors (9130829).

100438987 is an equidigital number, since it uses as much as digits as its factorization.

100438987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9130828.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 100438987 is about 10021.9253140302. The cubic root of 100438987 is about 464.8370909653.

The spelling of 100438987 in words is "one hundred million, four hundred thirty-eight thousand, nine hundred eighty-seven".