1239264 has 72 divisors (see below), whose sum is σ = 3806712. Its totient is φ = 380160.

The previous prime is 1239247. The next prime is 1239269. The reversal of 1239264 is 4629321.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1239269) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3579 + ... + 3909.

It is an arithmetic number, because the mean of its divisors is an integer number (52871).

2^1239264 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 1239264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1903356).

1239264 is an abundant number, since it is smaller than the sum of its proper divisors (2567448).

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

1239264 is a wasteful number, since it uses less digits than its factorization.

1239264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360 (or 349 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 1239264 is about 1113.2223497577. Note that the first 3 decimals coincide. The cubic root of 1239264 is about 107.4124471909.

The spelling of 1239264 in words is "one million, two hundred thirty-nine thousand, two hundred sixty-four".