1281915 has 24 divisors (see below), whose sum is σ = 2263248. Its totient is φ = 671040.

The previous prime is 1281899. The next prime is 1281937. The reversal of 1281915 is 5191821.

It is not a de Polignac number, because 1281915 - 2⁴ = 1281899 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2512 + ... + 2978.

It is an arithmetic number, because the mean of its divisors is an integer number (94302).

2^1281915 is an apocalyptic number.

1281915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1281915 is a deficient number, since it is larger than the sum of its proper divisors (981333).

1281915 is a wasteful number, since it uses less digits than its factorization.

1281915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539 (or 536 counting only the distinct ones).

The product of its digits is 720, while the sum is 27.

The square root of 1281915 is about 1132.2168520208. The cubic root of 1281915 is about 108.6308246596.

The spelling of 1281915 in words is "one million, two hundred eighty-one thousand, nine hundred fifteen".