1420645 has 4 divisors (see below), whose sum is σ = 1704780. Its totient is φ = 1136512.

The previous prime is 1420633. The next prime is 1420651. The reversal of 1420645 is 5460241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5460241 = 757 ⋅7213.

It can be written as a sum of positive squares in 2 ways, for example, as 948676 + 471969 = 974^2 + 687^2 .

It is a cyclic number.

It is not a de Polignac number, because 1420645 - 2⁵ = 1420613 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142060 + ... + 142069.

It is an arithmetic number, because the mean of its divisors is an integer number (426195).

2^1420645 is an apocalyptic number.

It is an amenable number.

1420645 is a deficient number, since it is larger than the sum of its proper divisors (284135).

1420645 is an equidigital number, since it uses as much as digits as its factorization.

1420645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284134.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 1420645 is about 1191.9081340439. The cubic root of 1420645 is about 112.4161020569.

Adding to 1420645 its reverse (5460241), we get a palindrome (6880886).

The spelling of 1420645 in words is "one million, four hundred twenty thousand, six hundred forty-five".