999424987 has 4 divisors (see below), whose sum is σ = 1090281816. Its totient is φ = 908568160.

The previous prime is 999424981. The next prime is 999425017. The reversal of 999424987 is 789424999.

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 999424987 - 2⁷ = 999424859 is a prime.

It is a pancake number, because a pancake can be divided into 999424987 parts by 44708 straight cuts.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999424981) 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, 45428398 + ... + 45428419.

It is an arithmetic number, because the mean of its divisors is an integer number (272570454).

Almost surely, 2^999424987 is an apocalyptic number.

999424987 is a deficient number, since it is larger than the sum of its proper divisors (90856829).

999424987 is a wasteful number, since it uses less digits than its factorization.

999424987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90856828.

The product of its digits is 11757312, while the sum is 61.

The square root of 999424987 is about 31613.6835405177. The cubic root of 999424987 is about 999.8082922505.

The spelling of 999424987 in words is "nine hundred ninety-nine million, four hundred twenty-four thousand, nine hundred eighty-seven".