1005404421 has 16 divisors (see below), whose sum is σ = 1546366464. Its totient is φ = 569146224.

The previous prime is 1005404377. The next prime is 1005404423. The reversal of 1005404421 is 1244045001.

It is a happy number.

1005404421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1005404421 - 2¹¹ = 1005402373 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005404423) 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, 221475 + ... + 225968.

It is an arithmetic number, because the mean of its divisors is an integer number (96647904).

Almost surely, 2^1005404421 is an apocalyptic number.

It is an amenable number.

1005404421 is a deficient number, since it is larger than the sum of its proper divisors (540962043).

1005404421 is a wasteful number, since it uses less digits than its factorization.

1005404421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447560.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 1005404421 is about 31708.1128577530. The cubic root of 1005404421 is about 1001.7982380682.

Adding to 1005404421 its reverse (1244045001), we get a palindrome (2249449422).

The spelling of 1005404421 in words is "one billion, five million, four hundred four thousand, four hundred twenty-one".