1421405 has 8 divisors (see below), whose sum is σ = 1731552. Its totient is φ = 1119888.

The previous prime is 1421401. The next prime is 1421417. The reversal of 1421405 is 5041241.

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 1421405 - 2² = 1421401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1787 + ... + 2456.

It is an arithmetic number, because the mean of its divisors is an integer number (216444).

2^1421405 is an apocalyptic number.

It is an amenable number.

1421405 is a deficient number, since it is larger than the sum of its proper divisors (310147).

1421405 is an equidigital number, since it uses as much as digits as its factorization.

1421405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4315.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 1421405 is about 1192.2269079332. The cubic root of 1421405 is about 112.4361448325.

Adding to 1421405 its reverse (5041241), we get a palindrome (6462646).

The spelling of 1421405 in words is "one million, four hundred twenty-one thousand, four hundred five".