999999424 has 28 divisors (see below), whose sum is σ = 1987366104. Its totient is φ = 499245824.

The previous prime is 999999391. The next prime is 999999433. The reversal of 999999424 is 424999999.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32274 + ... + 55150.

Almost surely, 2^999999424 is an apocalyptic number.

It is an amenable number.

999999424 is a deficient number, since it is larger than the sum of its proper divisors (987366680).

999999424 is a wasteful number, since it uses less digits than its factorization.

999999424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23572 (or 23562 counting only the distinct ones).

The product of its digits is 17006112, while the sum is 64.

The square root of 999999424 is about 31622.7674943228. The cubic root of 999999424 is about 999.9998080000. Note that the first 3 decimals are identical.

The spelling of 999999424 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, four hundred twenty-four".