1005838394 has 36 divisors (see below), whose sum is σ = 1687528206. Its totient is φ = 449301600.

The previous prime is 1005838387. The next prime is 1005838403. The reversal of 1005838394 is 4938385001.

It can be written as a sum of positive squares in 3 ways, for example, as 80766169 + 925072225 = 8987^2 + 30415^2 .

It is a super-3 number, since 3×1005838394³ (a number of 28 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 899924 + ... + 901040.

Almost surely, 2^1005838394 is an apocalyptic number.

1005838394 is a deficient number, since it is larger than the sum of its proper divisors (681689812).

1005838394 is a wasteful number, since it uses less digits than its factorization.

1005838394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263 (or 1191 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 1005838394 is about 31714.9553680909. The cubic root of 1005838394 is about 1001.9423561433.

The spelling of 1005838394 in words is "one billion, five million, eight hundred thirty-eight thousand, three hundred ninety-four".