1281725 has 12 divisors (see below), whose sum is σ = 1604064. Its totient is φ = 1015920.

The previous prime is 1281703. The next prime is 1281727. The reversal of 1281725 is 5271821.

It is not a de Polignac number, because 1281725 - 2¹² = 1277629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1281694 and 1281703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4022 + ... + 4328.

It is an arithmetic number, because the mean of its divisors is an integer number (133672).

2^1281725 is an apocalyptic number.

It is an amenable number.

1281725 is a deficient number, since it is larger than the sum of its proper divisors (322339).

1281725 is a wasteful number, since it uses less digits than its factorization.

1281725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484 (or 479 counting only the distinct ones).

The product of its digits is 1120, while the sum is 26.

The square root of 1281725 is about 1132.1329427236. The cubic root of 1281725 is about 108.6254574612.

It can be divided in two parts, 12 and 81725, that multiplied together give a triangular number (980700 = T₁₄₀₀).

The spelling of 1281725 in words is "one million, two hundred eighty-one thousand, seven hundred twenty-five".