1005420665 has 8 divisors (see below), whose sum is σ = 1214495808. Its totient is φ = 799009200.

The previous prime is 1005420631. The next prime is 1005420667. The reversal of 1005420665 is 5660245001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1005420665 - 2¹² = 1005416569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1005420667) 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 7 ways as a sum of consecutive naturals, for example, 665087 + ... + 666596.

It is an arithmetic number, because the mean of its divisors is an integer number (151811976).

Almost surely, 2^1005420665 is an apocalyptic number.

It is an amenable number.

1005420665 is a deficient number, since it is larger than the sum of its proper divisors (209075143).

1005420665 is a wasteful number, since it uses less digits than its factorization.

1005420665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331839.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1005420665 is about 31708.3690056742. The cubic root of 1005420665 is about 1001.8036332845.

Adding to 1005420665 its reverse (5660245001), we get a palindrome (6665665666).

The spelling of 1005420665 in words is "one billion, five million, four hundred twenty thousand, six hundred sixty-five".