1281975 has 12 divisors (see below), whose sum is σ = 2119656. Its totient is φ = 683680.

The previous prime is 1281971. The next prime is 1281979. The reversal of 1281975 is 5791821.

It is an interprime number because it is at equal distance from previous prime (1281971) and next prime (1281979).

It is not a de Polignac number, because 1281975 - 2² = 1281971 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

1281975 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1281971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8472 + ... + 8621.

It is an arithmetic number, because the mean of its divisors is an integer number (176638).

2^1281975 is an apocalyptic number.

1281975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1281975 is a deficient number, since it is larger than the sum of its proper divisors (837681).

1281975 is a wasteful number, since it uses less digits than its factorization.

1281975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17106 (or 17101 counting only the distinct ones).

The product of its digits is 5040, while the sum is 33.

The square root of 1281975 is about 1132.2433484017. The cubic root of 1281975 is about 108.6325194542.

The spelling of 1281975 in words is "one million, two hundred eighty-one thousand, nine hundred seventy-five".