1275921 has 6 divisors (see below), whose sum is σ = 1843010. Its totient is φ = 850608.

The previous prime is 1275899. The next prime is 1275931. The reversal of 1275921 is 1295721.

It can be written as a sum of positive squares in only one way, i.e., 1185921 + 90000 = 1089^2 + 300^2 .

It is not a de Polignac number, because 1275921 - 2⁵ = 1275889 is a prime.

It is a Duffinian number.

1275921 is a lucky number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (1275931) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 70876 + ... + 70893.

2^1275921 is an apocalyptic number.

It is an amenable number.

1275921 is a deficient number, since it is larger than the sum of its proper divisors (567089).

1275921 is a wasteful number, since it uses less digits than its factorization.

1275921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141775 (or 141772 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 1275921 is about 1129.5667310965. The cubic root of 1275921 is about 108.4612474601.

The spelling of 1275921 in words is "one million, two hundred seventy-five thousand, nine hundred twenty-one".