1420865 has 4 divisors (see below), whose sum is σ = 1705044. Its totient is φ = 1136688.

The previous prime is 1420847. The next prime is 1420879. The reversal of 1420865 is 5680241.

It is a Cunningham number, because it is equal to 1192²+1.

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 512656 + 908209 = 716^2 + 953^2 .

It is a cyclic number.

It is not a de Polignac number, because 1420865 - 2¹² = 1416769 is a prime.

It is a Duffinian 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, 142082 + ... + 142091.

It is an arithmetic number, because the mean of its divisors is an integer number (426261).

2^1420865 is an apocalyptic number.

It is an amenable number.

1420865 is a deficient number, since it is larger than the sum of its proper divisors (284179).

1420865 is an equidigital number, since it uses as much as digits as its factorization.

1420865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284178.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 1420865 is about 1192.0004194630. Note that the first 3 decimals coincide. The cubic root of 1420865 is about 112.4219046480.

The spelling of 1420865 in words is "one million, four hundred twenty thousand, eight hundred sixty-five".