1297928 has 16 divisors (see below), whose sum is σ = 2562000. Its totient is φ = 614736.

The previous prime is 1297927. The next prime is 1297963. The reversal of 1297928 is 8297921.

1297928 = 122² + 123² + ... + 178².

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 1297891 and 1297900.

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 3 ways as a sum of consecutive naturals, for example, 4118 + ... + 4421.

It is an arithmetic number, because the mean of its divisors is an integer number (160125).

2^1297928 is an apocalyptic number.

It is an amenable number.

1297928 is a deficient number, since it is larger than the sum of its proper divisors (1264072).

1297928 is a wasteful number, since it uses less digits than its factorization.

1297928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8564 (or 8560 counting only the distinct ones).

The product of its digits is 18144, while the sum is 38.

The square root of 1297928 is about 1139.2664306474. The cubic root of 1297928 is about 109.0812737281.

The spelling of 1297928 in words is "one million, two hundred ninety-seven thousand, nine hundred twenty-eight".