999457280 has 40 divisors (see below), whose sum is σ = 2396361132. Its totient is φ = 399781888.

The previous prime is 999457271. The next prime is 999457289. The reversal of 999457280 is 82754999.

It is an interprime number because it is at equal distance from previous prime (999457271) and next prime (999457289).

It can be written as a sum of positive squares in 2 ways, for example, as 966463744 + 32993536 = 31088^2 + 5744^2 .

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

It is not an unprimeable number, because it can be changed into a prime (999457289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192647 + ... + 197766.

Almost surely, 2^999457280 is an apocalyptic number.

It is an amenable number.

999457280 is an abundant number, since it is smaller than the sum of its proper divisors (1396903852).

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

999457280 is an equidigital number, since it uses as much as digits as its factorization.

999457280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390436 (or 390420 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 53.

The square root of 999457280 is about 31614.1942804178. The cubic root of 999457280 is about 999.8190605962.

The spelling of 999457280 in words is "nine hundred ninety-nine million, four hundred fifty-seven thousand, two hundred eighty".