1265421 has 4 divisors (see below), whose sum is σ = 1687232. Its totient is φ = 843612.

The previous prime is 1265393. The next prime is 1265431. The reversal of 1265421 is 1245621.

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.

It is not a de Polignac number, because 1265421 - 2⁹ = 1264909 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210901 + ... + 210906.

It is an arithmetic number, because the mean of its divisors is an integer number (421808).

2^1265421 is an apocalyptic number.

It is an amenable number.

1265421 is a deficient number, since it is larger than the sum of its proper divisors (421811).

1265421 is an equidigital number, since it uses as much as digits as its factorization.

1265421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421810.

The product of its digits is 480, while the sum is 21.

The square root of 1265421 is about 1124.9093296795. The cubic root of 1265421 is about 108.1629057292.

The spelling of 1265421 in words is "one million, two hundred sixty-five thousand, four hundred twenty-one".