1281925 has 12 divisors (see below), whose sum is σ = 1624896. Its totient is φ = 1002800.

The previous prime is 1281899. The next prime is 1281937. The reversal of 1281925 is 5291821.

It is not a de Polignac number, because 1281925 - 2¹¹ = 1279877 is a prime.

It is a Duffinian number.

1281925 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1281893 and 1281902.

It is a congruent number.

It is an unprimeable number.

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, 630 + ... + 1720.

It is an arithmetic number, because the mean of its divisors is an integer number (135408).

2^1281925 is an apocalyptic number.

It is an amenable number.

1281925 is a deficient number, since it is larger than the sum of its proper divisors (342971).

1281925 is a wasteful number, since it uses less digits than its factorization.

1281925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148 (or 1143 counting only the distinct ones).

The product of its digits is 1440, while the sum is 28.

The square root of 1281925 is about 1132.2212681274. The cubic root of 1281925 is about 108.6311071291.

The spelling of 1281925 in words is "one million, two hundred eighty-one thousand, nine hundred twenty-five".