1280697 has 12 divisors (see below), whose sum is σ = 1872336. Its totient is φ = 772240.

The previous prime is 1280693. The next prime is 1280707. The reversal of 1280697 is 7960821.

It is not a de Polignac number, because 1280697 - 2² = 1280693 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (1280693) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 6403 + ... + 6599.

It is an arithmetic number, because the mean of its divisors is an integer number (156028).

2^1280697 is an apocalyptic number.

It is an amenable number.

1280697 is a deficient number, since it is larger than the sum of its proper divisors (591639).

1280697 is an equidigital number, since it uses as much as digits as its factorization.

1280697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408 (or 211 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 1280697 is about 1131.6788413680. The cubic root of 1280697 is about 108.5964088906.

Multiplying 1280697 by its sum of digits (33), we get a square (42263001 = 6501²).

1280697 divided by its sum of digits (33) gives a square (38809 = 197²).

The spelling of 1280697 in words is "one million, two hundred eighty thousand, six hundred ninety-seven".