1005212340 has 108 divisors (see below), whose sum is σ = 3351611172. Its totient is φ = 243682560.

The previous prime is 1005212311. The next prime is 1005212371. The reversal of 1005212340 is 432125001.

1005212340 is a `hidden beast` number, since 100 + 521 + 2 + 3 + 40 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 690007824 + 315204516 = 26268^2 + 17754^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 1297 + ... + 44856.

Almost surely, 2^1005212340 is an apocalyptic number.

1005212340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1005212340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1675805586).

1005212340 is an abundant number, since it is smaller than the sum of its proper divisors (2346398832).

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

1005212340 is a wasteful number, since it uses less digits than its factorization.

1005212340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46190 (or 46174 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1005212340 is about 31705.0838194760. The cubic root of 1005212340 is about 1001.7344366569.

Adding to 1005212340 its reverse (432125001), we get a palindrome (1437337341).

The spelling of 1005212340 in words is "one billion, five million, two hundred twelve thousand, three hundred forty".