1445421 has 4 divisors (see below), whose sum is σ = 1927232. Its totient is φ = 963612.

The previous prime is 1445419. The next prime is 1445429. The reversal of 1445421 is 1245441.

It is a happy number.

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: 1245441 = 3 ⋅415147.

It is not a de Polignac number, because 1445421 - 2¹ = 1445419 is a prime.

It is a D-number.

It is a Duffinian number.

1445421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1445429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 240901 + ... + 240906.

It is an arithmetic number, because the mean of its divisors is an integer number (481808).

2^1445421 is an apocalyptic number.

It is an amenable number.

1445421 is a deficient number, since it is larger than the sum of its proper divisors (481811).

1445421 is an equidigital number, since it uses as much as digits as its factorization.

1445421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481810.

The product of its digits is 640, while the sum is 21.

The square root of 1445421 is about 1202.2566281789. The cubic root of 1445421 is about 113.0658503594.

It can be divided in two parts, 144 and 5421, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 1445421 in words is "one million, four hundred forty-five thousand, four hundred twenty-one".