1231264 has 24 divisors (see below), whose sum is σ = 2453220. Its totient is φ = 608256.

The previous prime is 1231261. The next prime is 1231267. The reversal of 1231264 is 4621321.

It is an interprime number because it is at equal distance from previous prime (1231261) and next prime (1231267).

It can be written as a sum of positive squares in 2 ways, for example, as 1227664 + 3600 = 1108^2 + 60^2 .

It is a super-2 number, since 2×1231264² = 3032022075392, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231261) 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, 3312 + ... + 3664.

2^1231264 is an apocalyptic number.

It is an amenable number.

1231264 is a deficient number, since it is larger than the sum of its proper divisors (1221956).

1231264 is a wasteful number, since it uses less digits than its factorization.

1231264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472 (or 464 counting only the distinct ones).

The product of its digits is 288, while the sum is 19.

The square root of 1231264 is about 1109.6233595234. The cubic root of 1231264 is about 107.1808163489.

Adding to 1231264 its reverse (4621321), we get a palindrome (5852585).

The spelling of 1231264 in words is "one million, two hundred thirty-one thousand, two hundred sixty-four".