1281375 has 48 divisors (see below), whose sum is σ = 2482272. Its totient is φ = 633600.

The previous prime is 1281367. The next prime is 1281383. The reversal of 1281375 is 5731821.

It is an interprime number because it is at equal distance from previous prime (1281367) and next prime (1281383).

It is not a de Polignac number, because 1281375 - 2³ = 1281367 is a prime.

Its product of digits (1680) is a multiple of the sum of its prime factors (105).

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 19092 + ... + 19158.

It is an arithmetic number, because the mean of its divisors is an integer number (51714).

2^1281375 is an apocalyptic number.

1281375 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1281375 is a deficient number, since it is larger than the sum of its proper divisors (1200897).

1281375 is a wasteful number, since it uses less digits than its factorization.

1281375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105 (or 92 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 1281375 is about 1131.9783566836. The cubic root of 1281375 is about 108.6155691281.

The spelling of 1281375 in words is "one million, two hundred eighty-one thousand, three hundred seventy-five".