1420605 has 32 divisors (see below), whose sum is σ = 2678400. Its totient is φ = 711936.

The previous prime is 1420603. The next prime is 1420607. The reversal of 1420605 is 5060241.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1420603) and next prime (1420607).

It is not a de Polignac number, because 1420605 - 2¹ = 1420603 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1420603) 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 31 ways as a sum of consecutive naturals, for example, 1986 + ... + 2604.

It is an arithmetic number, because the mean of its divisors is an integer number (83700).

2^1420605 is an apocalyptic number.

1420605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1420605 is a deficient number, since it is larger than the sum of its proper divisors (1257795).

1420605 is a wasteful number, since it uses less digits than its factorization.

1420605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650 (or 644 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1420605 is about 1191.8913541091. The cubic root of 1420605 is about 112.4150469760.

Adding to 1420605 its reverse (5060241), we get a palindrome (6480846).

It can be divided in two parts, 1420 and 605, that added together give a square (2025 = 45²).

The spelling of 1420605 in words is "one million, four hundred twenty thousand, six hundred five".