1281995 has 24 divisors (see below), whose sum is σ = 1832208. Its totient is φ = 855360.

The previous prime is 1281983. The next prime is 1282007. The reversal of 1281995 is 5991821.

It is an interprime number because it is at equal distance from previous prime (1281983) and next prime (1282007).

It is not a de Polignac number, because 1281995 - 2⁴ = 1281979 is a prime.

It is a super-2 number, since 2×1281995² = 3287022360050, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian 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 23 ways as a sum of consecutive naturals, for example, 7784 + ... + 7946.

It is an arithmetic number, because the mean of its divisors is an integer number (76342).

2^1281995 is an apocalyptic number.

1281995 is a deficient number, since it is larger than the sum of its proper divisors (550213).

1281995 is a wasteful number, since it uses less digits than its factorization.

1281995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203 (or 192 counting only the distinct ones).

The product of its digits is 6480, while the sum is 35.

The square root of 1281995 is about 1132.2521803909. The cubic root of 1281995 is about 108.6330843740.

The spelling of 1281995 in words is "one million, two hundred eighty-one thousand, nine hundred ninety-five".