1245664 has 48 divisors (see below), whose sum is σ = 2878848. Its totient is φ = 519552.

The previous prime is 1245649. The next prime is 1245683. The reversal of 1245664 is 4665421.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14967 + ... + 15049.

It is an arithmetic number, because the mean of its divisors is an integer number (59976).

2^1245664 is an apocalyptic number.

1245664 is a gapful number since it is divisible by the number (14) 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 1245664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1439424).

1245664 is an abundant number, since it is smaller than the sum of its proper divisors (1633184).

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

1245664 is an equidigital number, since it uses as much as digits as its factorization.

1245664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 159 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 1245664 is about 1116.0931860736. The cubic root of 1245664 is about 107.5970351537.

The spelling of 1245664 in words is "one million, two hundred forty-five thousand, six hundred sixty-four".