1421555 has 4 divisors (see below), whose sum is σ = 1705872. Its totient is φ = 1137240.

The previous prime is 1421549. The next prime is 1421569. The reversal of 1421555 is 5551241.

It is a happy number.

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

It is not a de Polignac number, because 1421555 - 2¹² = 1417459 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1421555.

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, 142151 + ... + 142160.

It is an arithmetic number, because the mean of its divisors is an integer number (426468).

2^1421555 is an apocalyptic number.

1421555 is a deficient number, since it is larger than the sum of its proper divisors (284317).

1421555 is an equidigital number, since it uses as much as digits as its factorization.

1421555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284316.

The product of its digits is 1000, while the sum is 23.

The square root of 1421555 is about 1192.2898137617. The cubic root of 1421555 is about 112.4400997993.

Adding to 1421555 its reverse (5551241), we get a palindrome (6972796).

The spelling of 1421555 in words is "one million, four hundred twenty-one thousand, five hundred fifty-five".