1420289 has 4 divisors (see below), whose sum is σ = 1529556. Its totient is φ = 1311024.

The previous prime is 1420283. The next prime is 1420291. The reversal of 1420289 is 9820241.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 369664 + 1050625 = 608^2 + 1025^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1420289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1420283) 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, 54614 + ... + 54639.

It is an arithmetic number, because the mean of its divisors is an integer number (382389).

2^1420289 is an apocalyptic number.

It is an amenable number.

1420289 is a deficient number, since it is larger than the sum of its proper divisors (109267).

1420289 is a wasteful number, since it uses less digits than its factorization.

1420289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109266.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1420289 is about 1191.7587843184. The cubic root of 1420289 is about 112.4067111404.

The spelling of 1420289 in words is "one million, four hundred twenty thousand, two hundred eighty-nine".