999959540 has 12 divisors (see below), whose sum is σ = 2099915076. Its totient is φ = 399983808.

The previous prime is 999959507. The next prime is 999959557. The reversal of 999959540 is 45959999.

It can be written as a sum of positive squares in 2 ways, for example, as 534349456 + 465610084 = 23116^2 + 21578^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 999959540.

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, 24998969 + ... + 24999008.

It is an arithmetic number, because the mean of its divisors is an integer number (174992923).

Almost surely, 2^999959540 is an apocalyptic number.

It is an amenable number.

999959540 is an abundant number, since it is smaller than the sum of its proper divisors (1099955536).

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

999959540 is a wasteful number, since it uses less digits than its factorization.

999959540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49997986 (or 49997984 counting only the distinct ones).

The product of its (nonzero) digits is 5904900, while the sum is 59.

The square root of 999959540 is about 31622.1368664422. The cubic root of 999959540 is about 999.9865131514.

The spelling of 999959540 in words is "nine hundred ninety-nine million, nine hundred fifty-nine thousand, five hundred forty".