999264 has 48 divisors (see below), whose sum is σ = 2999808. Its totient is φ = 285312.

The previous prime is 999239. The next prime is 999269. The reversal of 999264 is 462999.

It is a tau number, because it is divible by the number of its divisors (48).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72 + ... + 1415.

It is an arithmetic number, because the mean of its divisors is an integer number (62496).

2⁹⁹⁹²⁶⁴ 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 999264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1499904).

999264 is an abundant number, since it is smaller than the sum of its proper divisors (2000544).

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

999264 is a wasteful number, since it uses less digits than its factorization.

999264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507 (or 1499 counting only the distinct ones).

The product of its digits is 34992, while the sum is 39.

The square root of 999264 is about 999.6319322631. The cubic root of 999264 is about 99.9754606454.

The spelling of 999264 in words is "nine hundred ninety-nine thousand, two hundred sixty-four".