1297920 has 120 divisors (see below), whose sum is σ = 4493016. Its totient is φ = 319488.

The previous prime is 1297873. The next prime is 1297927. The reversal of 1297920 is 297921.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1297927) 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, 99834 + ... + 99846.

2^1297920 is an apocalyptic number.

1297920 is a gapful number since it is divisible by the number (10) 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 1297920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2246508).

1297920 is an abundant number, since it is smaller than the sum of its proper divisors (3195096).

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

1297920 is an equidigital number, since it uses as much as digits as its factorization.

1297920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52 (or 23 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 1297920 is about 1139.2629196107. The cubic root of 1297920 is about 109.0810496140.

Multiplying 1297920 by its sum of digits (30), we get a square (38937600 = 6240²).

1297920 divided by its sum of digits (30) gives a square (43264 = 208²).

Subtracting from 1297920 its reverse (297921), we obtain a palindrome (999999).

The spelling of 1297920 in words is "one million, two hundred ninety-seven thousand, nine hundred twenty".