1994138508 has 12 divisors (see below), whose sum is σ = 4652989880. Its totient is φ = 664712832.

The previous prime is 1994138507. The next prime is 1994138533. The reversal of 1994138508 is 8058314991.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1994138501) 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, 83089093 + ... + 83089116.

Almost surely, 2^1994138508 is an apocalyptic number.

It is an amenable number.

1994138508 is an abundant number, since it is smaller than the sum of its proper divisors (2658851372).

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

1994138508 is a wasteful number, since it uses less digits than its factorization.

1994138508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166178216 (or 166178214 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 48.

The square root of 1994138508 is about 44655.7779912074. Note that the first 3 decimals coincide. The cubic root of 1994138508 is about 1258.6890093181.

The spelling of 1994138508 in words is "one billion, nine hundred ninety-four million, one hundred thirty-eight thousand, five hundred eight".