1994803381 has 8 divisors (see below), whose sum is σ = 2049327000. Its totient is φ = 1940559360.

The previous prime is 1994803379. The next prime is 1994803397. The reversal of 1994803381 is 1833084991.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 19000881 + 1975802500 = 4359^2 + 44450^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1994803381 - 2¹ = 1994803379 is a prime.

It is a super-2 number, since 2×1994803381² = 7958481057698062322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1994803361) 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, 55396 + ... + 84013.

It is an arithmetic number, because the mean of its divisors is an integer number (256165875).

Almost surely, 2^1994803381 is an apocalyptic number.

It is an amenable number.

1994803381 is a deficient number, since it is larger than the sum of its proper divisors (54523619).

1994803381 is a wasteful number, since it uses less digits than its factorization.

1994803381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139799.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 1994803381 is about 44663.2217937757. The cubic root of 1994803381 is about 1258.8288818067.

The spelling of 1994803381 in words is "one billion, nine hundred ninety-four million, eight hundred three thousand, three hundred eighty-one".