999505920 has 360 divisors, whose sum is σ = 3765321504. Its totient is φ = 225705984.

The previous prime is 999505861. The next prime is 999505931. The reversal of 999505920 is 29505999.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 999505920.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12042199 + ... + 12042281.

Almost surely, 2^999505920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999505920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1882660752).

999505920 is an abundant number, since it is smaller than the sum of its proper divisors (2765815584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999505920 is an equidigital number, since it uses as much as digits as its factorization.

999505920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 328050, while the sum is 48.

The square root of 999505920 is about 31614.9635457642. The cubic root of 999505920 is about 999.8352795353.

The spelling of 999505920 in words is "nine hundred ninety-nine million, five hundred five thousand, nine hundred twenty".