1420509 has 4 divisors (see below), whose sum is σ = 1894016. Its totient is φ = 947004.

The previous prime is 1420501. The next prime is 1420511. The reversal of 1420509 is 9050241.

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: 9050241 = 3 ⋅3016747.

It is not a de Polignac number, because 1420509 - 2³ = 1420501 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1420501) 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, 236749 + ... + 236754.

It is an arithmetic number, because the mean of its divisors is an integer number (473504).

2^1420509 is an apocalyptic number.

It is an amenable number.

1420509 is a deficient number, since it is larger than the sum of its proper divisors (473507).

1420509 is an equidigital number, since it uses as much as digits as its factorization.

1420509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473506.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1420509 is about 1191.8510813017. The cubic root of 1420509 is about 112.4125147010.

The spelling of 1420509 in words is "one million, four hundred twenty thousand, five hundred nine".