999757440 has 384 divisors, whose sum is σ = 3895257600. Its totient is φ = 234086400.

The previous prime is 999757433. The next prime is 999757441. The reversal of 999757440 is 44757999.

It is a tau number, because it is divible by the number of its divisors (384).

It is not an unprimeable number, because it can be changed into a prime (999757441) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1963906 + ... + 1964414.

It is an arithmetic number, because the mean of its divisors is an integer number (10143900).

Almost surely, 2^999757440 is an apocalyptic number.

999757440 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999757440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1947628800).

999757440 is an abundant number, since it is smaller than the sum of its proper divisors (2895500160).

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

999757440 is a wasteful number, since it uses less digits than its factorization.

999757440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576 (or 561 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 54.

The square root of 999757440 is about 31618.9411587422. The cubic root of 999757440 is about 999.9191401285.

The spelling of 999757440 in words is "nine hundred ninety-nine million, seven hundred fifty-seven thousand, four hundred forty".