1421240605 has 16 divisors (see below), whose sum is σ = 1765121904. Its totient is φ = 1097809920.

The previous prime is 1421240551. The next prime is 1421240609. The reversal of 1421240605 is 5060421241.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 38962564 + 1382278041 = 6242^2 + 37179^2 .

It is not a de Polignac number, because 1421240605 - 2¹¹ = 1421238557 is a prime.

It is a super-3 number, since 3×1421240605³ (a number of 28 digits) contains 333 as substring.

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 1421240605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421240609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15852 + ... + 55621.

It is an arithmetic number, because the mean of its divisors is an integer number (110320119).

Almost surely, 2^1421240605 is an apocalyptic number.

It is an amenable number.

1421240605 is a deficient number, since it is larger than the sum of its proper divisors (343881299).

1421240605 is an equidigital number, since it uses as much as digits as its factorization.

1421240605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71616.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 1421240605 is about 37699.3448882073. The cubic root of 1421240605 is about 1124.3181000122.

Adding to 1421240605 its reverse (5060421241), we get a palindrome (6481661846).

The spelling of 1421240605 in words is "one billion, four hundred twenty-one million, two hundred forty thousand, six hundred five".