1005217405 has 4 divisors (see below), whose sum is σ = 1206260892. Its totient is φ = 804173920.

The previous prime is 1005217403. The next prime is 1005217481. The reversal of 1005217405 is 5047125001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5047125001 = 157 ⋅32147293.

It can be written as a sum of positive squares in 2 ways, for example, as 517426009 + 487791396 = 22747^2 + 22086^2 .

It is not a de Polignac number, because 1005217405 - 2¹ = 1005217403 is a prime.

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 1005217405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005217403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100521736 + ... + 100521745.

It is an arithmetic number, because the mean of its divisors is an integer number (301565223).

Almost surely, 2^1005217405 is an apocalyptic number.

It is an amenable number.

1005217405 is a deficient number, since it is larger than the sum of its proper divisors (201043487).

1005217405 is an equidigital number, since it uses as much as digits as its factorization.

1005217405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201043486.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 1005217405 is about 31705.1636961552. The cubic root of 1005217405 is about 1001.7361191460.

The spelling of 1005217405 in words is "one billion, five million, two hundred seventeen thousand, four hundred five".