1297764 has 72 divisors (see below), whose sum is σ = 3669120. Its totient is φ = 384192.

The previous prime is 1297739. The next prime is 1297771. The reversal of 1297764 is 4677921.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21967 + ... + 22025.

It is an arithmetic number, because the mean of its divisors is an integer number (50960).

2^1297764 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 1297764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1834560).

1297764 is an abundant number, since it is smaller than the sum of its proper divisors (2371356).

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

1297764 is a wasteful number, since it uses less digits than its factorization.

1297764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 124 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 1297764 is about 1139.1944522337. The cubic root of 1297764 is about 109.0766792045.

It can be divided in two parts, 12977 and 64, that added together give a triangular number (13041 = T₁₆₁).

The spelling of 1297764 in words is "one million, two hundred ninety-seven thousand, seven hundred sixty-four".