1421605444 has 18 divisors (see below), whose sum is σ = 2893982910. Its totient is φ = 609259392.

The previous prime is 1421605439. The next prime is 1421605447. The reversal of 1421605444 is 4445061241.

It can be written as a sum of positive squares in only one way, i.e., 1143116100 + 278489344 = 33810^2 + 16688^2 .

It is not an unprimeable number, because it can be changed into a prime (1421605447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3626349 + ... + 3626740.

Almost surely, 2^1421605444 is an apocalyptic number.

1421605444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1421605444 is an abundant number, since it is smaller than the sum of its proper divisors (1472377466).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1421605444 is a wasteful number, since it uses less digits than its factorization.

1421605444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7253107 (or 7253098 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 31.

The square root of 1421605444 is about 37704.1833753232. The cubic root of 1421605444 is about 1124.4142976570.

Adding to 1421605444 its reverse (4445061241), we get a palindrome (5866666685).

The spelling of 1421605444 in words is "one billion, four hundred twenty-one million, six hundred five thousand, four hundred forty-four".