1280625 has 20 divisors (see below), whose sum is σ = 2136816. Its totient is φ = 682000.

The previous prime is 1280623. The next prime is 1280633. The reversal of 1280625 is 5260821.

It is not a de Polignac number, because 1280625 - 2¹ = 1280623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1280595 and 1280604.

It is not an unprimeable number, because it can be changed into a prime (1280623) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1534 + ... + 2216.

2^1280625 is an apocalyptic number.

1280625 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1280625 is a deficient number, since it is larger than the sum of its proper divisors (856191).

1280625 is an frugal number, since it uses more digits than its factorization.

1280625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706 (or 691 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1280625 is about 1131.6470297756. The cubic root of 1280625 is about 108.5943737780.

The spelling of 1280625 in words is "one million, two hundred eighty thousand, six hundred twenty-five".