1298664 has 48 divisors (see below), whose sum is σ = 3727620. Its totient is φ = 407040.

The previous prime is 1298653. The next prime is 1298699. The reversal of 1298664 is 4668921.

It can be written as a sum of positive squares in 2 ways, for example, as 1232100 + 66564 = 1110^2 + 258^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 694 + ... + 1754.

2^1298664 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 1298664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1863810).

1298664 is an abundant number, since it is smaller than the sum of its proper divisors (2428956).

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

1298664 is a wasteful number, since it uses less digits than its factorization.

1298664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090 (or 1083 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 1298664 is about 1139.5893997401. The cubic root of 1298664 is about 109.1018882889.

The spelling of 1298664 in words is "one million, two hundred ninety-eight thousand, six hundred sixty-four".