1421553 has 16 divisors (see below), whose sum is σ = 2186240. Its totient is φ = 804816.

The previous prime is 1421549. The next prime is 1421569. The reversal of 1421553 is 3551241.

It is not a de Polignac number, because 1421553 - 2² = 1421549 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

1421553 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1421543) 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 15 ways as a sum of consecutive naturals, for example, 2676 + ... + 3162.

It is an arithmetic number, because the mean of its divisors is an integer number (136640).

2^1421553 is an apocalyptic number.

It is an amenable number.

1421553 is a deficient number, since it is larger than the sum of its proper divisors (764687).

1421553 is a wasteful number, since it uses less digits than its factorization.

1421553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636.

The product of its digits is 600, while the sum is 21.

The square root of 1421553 is about 1192.2889750392. The cubic root of 1421553 is about 112.4400470682.

Adding to 1421553 its reverse (3551241), we get a palindrome (4972794).

The spelling of 1421553 in words is "one million, four hundred twenty-one thousand, five hundred fifty-three".