1420309 has 4 divisors (see below), whose sum is σ = 1549440. Its totient is φ = 1291180.

The previous prime is 1420303. The next prime is 1420357. The reversal of 1420309 is 9030241.

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 1420309 - 2³ = 1420301 is a prime.

It is a Duffinian number.

1420309 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1420301) 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, 64549 + ... + 64570.

It is an arithmetic number, because the mean of its divisors is an integer number (387360).

2^1420309 is an apocalyptic number.

It is an amenable number.

1420309 is a deficient number, since it is larger than the sum of its proper divisors (129131).

1420309 is a wasteful number, since it uses less digits than its factorization.

1420309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129130.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1420309 is about 1191.7671752486. The cubic root of 1420309 is about 112.4072387616.

The spelling of 1420309 in words is "one million, four hundred twenty thousand, three hundred nine".