1420405 has 8 divisors (see below), whose sum is σ = 1948032. Its totient is φ = 973968.

The previous prime is 1420403. The next prime is 1420429. The reversal of 1420405 is 5040241.

1420405 = 163² + 164² + ... + 204².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1420405 - 2¹ = 1420403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1420403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20257 + ... + 20326.

It is an arithmetic number, because the mean of its divisors is an integer number (243504).

2^1420405 is an apocalyptic number.

It is an amenable number.

1420405 is a deficient number, since it is larger than the sum of its proper divisors (527627).

1420405 is an equidigital number, since it uses as much as digits as its factorization.

1420405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40595.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 1420405 is about 1191.8074508913. The cubic root of 1420405 is about 112.4097712743.

Adding to 1420405 its reverse (5040241), we get a palindrome (6460646).

The spelling of 1420405 in words is "one million, four hundred twenty thousand, four hundred five".