999824402 has 4 divisors (see below), whose sum is σ = 1499736606. Its totient is φ = 499912200.

The previous prime is 999824393. The next prime is 999824407. The reversal of 999824402 is 204428999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 204428999 = 19 ⋅10759421.

It can be written as a sum of positive squares in only one way, i.e., 602260681 + 397563721 = 24541^2 + 19939^2 .

It is not an unprimeable number, because it can be changed into a prime (999824407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249956099 + ... + 249956102.

Almost surely, 2^999824402 is an apocalyptic number.

999824402 is a deficient number, since it is larger than the sum of its proper divisors (499912204).

999824402 is a wasteful number, since it uses less digits than its factorization.

999824402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499912203.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 999824402 is about 31620.0000316256. Note that the first 4 decimals coincide. The cubic root of 999824402 is about 999.9414639069.

The spelling of 999824402 in words is "nine hundred ninety-nine million, eight hundred twenty-four thousand, four hundred two".