1275621 has 4 divisors (see below), whose sum is σ = 1700832. Its totient is φ = 850412.

The previous prime is 1275611. The next prime is 1275643. The reversal of 1275621 is 1265721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1265721 = 3 ⋅421907.

It is a cyclic number.

It is not a de Polignac number, because 1275621 - 2¹³ = 1267429 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 1275591 and 1275600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1275601) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 212601 + ... + 212606.

It is an arithmetic number, because the mean of its divisors is an integer number (425208).

2^1275621 is an apocalyptic number.

It is an amenable number.

1275621 is a deficient number, since it is larger than the sum of its proper divisors (425211).

1275621 is an equidigital number, since it uses as much as digits as its factorization.

1275621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425210.

The product of its digits is 840, while the sum is 24.

The square root of 1275621 is about 1129.4339290105. The cubic root of 1275621 is about 108.4527461697.

The spelling of 1275621 in words is "one million, two hundred seventy-five thousand, six hundred twenty-one".