1321975 has 6 divisors (see below), whose sum is σ = 1639280. Its totient is φ = 1057560.

The previous prime is 1321961. The next prime is 1321981. The reversal of 1321975 is 5791231.

It is not a de Polignac number, because 1321975 - 2⁷ = 1321847 is a prime.

It is an Ulam number.

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 5 ways as a sum of consecutive naturals, for example, 26415 + ... + 26464.

2^1321975 is an apocalyptic number.

1321975 is a deficient number, since it is larger than the sum of its proper divisors (317305).

1321975 is an equidigital number, since it uses as much as digits as its factorization.

1321975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52889 (or 52884 counting only the distinct ones).

The product of its digits is 1890, while the sum is 28.

The square root of 1321975 is about 1149.7717164724. The cubic root of 1321975 is about 109.7508133459.

The spelling of 1321975 in words is "one million, three hundred twenty-one thousand, nine hundred seventy-five".