1297905 has 32 divisors (see below), whose sum is σ = 2433024. Its totient is φ = 578496.

The previous prime is 1297873. The next prime is 1297927. The reversal of 1297905 is 5097921.

It is not a de Polignac number, because 1297905 - 2⁵ = 1297873 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 4804 + ... + 5066.

It is an arithmetic number, because the mean of its divisors is an integer number (76032).

2^1297905 is an apocalyptic number.

1297905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1297905 is a deficient number, since it is larger than the sum of its proper divisors (1135119).

1297905 is a wasteful number, since it uses less digits than its factorization.

1297905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325.

The product of its (nonzero) digits is 5670, while the sum is 33.

The square root of 1297905 is about 1139.2563363879. The cubic root of 1297905 is about 109.0806293975.

It can be divided in two parts, 129790 and 5, that added together give a triangular number (129795 = T₅₀₉).

The spelling of 1297905 in words is "one million, two hundred ninety-seven thousand, nine hundred five".