1321905 has 16 divisors (see below), whose sum is σ = 2278080. Its totient is φ = 650688.

The previous prime is 1321897. The next prime is 1321919. The reversal of 1321905 is 5091231.

It is not a de Polignac number, because 1321905 - 2³ = 1321897 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3195 + ... + 3584.

It is an arithmetic number, because the mean of its divisors is an integer number (142380).

2^1321905 is an apocalyptic number.

1321905 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1321905 is a deficient number, since it is larger than the sum of its proper divisors (956175).

1321905 is a wasteful number, since it uses less digits than its factorization.

1321905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6800.

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 1321905 is about 1149.7412752441. The cubic root of 1321905 is about 109.7488761705.

The spelling of 1321905 in words is "one million, three hundred twenty-one thousand, nine hundred five".