999920002 has 16 divisors (see below), whose sum is σ = 1515543480. Its totient is φ = 494750592.

The previous prime is 999919981. The next prime is 999920003. The reversal of 999920002 is 200029999.

It can be written as a sum of positive squares in 4 ways, for example, as 959202841 + 40717161 = 30971^2 + 6381^2 .

It is not an unprimeable number, because it can be changed into a prime (999920003) 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, 205348 + ... + 210160.

Almost surely, 2^999920002 is an apocalyptic number.

999920002 is a deficient number, since it is larger than the sum of its proper divisors (515623478).

999920002 is a wasteful number, since it uses less digits than its factorization.

999920002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5877.

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 999920002 is about 31621.5116969445. The cubic root of 999920002 is about 999.9733332889.

The spelling of 999920002 in words is "nine hundred ninety-nine million, nine hundred twenty thousand, two".