999999440 has 40 divisors (see below), whose sum is σ = 2536364448. Its totient is φ = 363635840.

The previous prime is 999999433. The next prime is 999999487. The reversal of 999999440 is 44999999.

It is a tau number, because it is divible by the number of its divisors (40).

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 567302 + ... + 569061.

Almost surely, 2^999999440 is an apocalyptic number.

It is an amenable number.

999999440 is an abundant number, since it is smaller than the sum of its proper divisors (1536365008).

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

999999440 is a wasteful number, since it uses less digits than its factorization.

999999440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136387 (or 1136381 counting only the distinct ones).

The product of its (nonzero) digits is 8503056, while the sum is 62.

The square root of 999999440 is about 31622.7677473051. The cubic root of 999999440 is about 999.9998133333. Note that the first 3 decimals are identical.

The spelling of 999999440 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, four hundred forty".