1981408119 has 8 divisors (see below), whose sum is σ = 2643251952. Its totient is φ = 1320251520.

The previous prime is 1981408111. The next prime is 1981408129. The reversal of 1981408119 is 9118041891.

It is a happy number.

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

It is not a de Polignac number, because 1981408119 - 2³ = 1981408111 is a prime.

It is a super-3 number, since 3×1981408119³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981408111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 165042 + ... + 176639.

It is an arithmetic number, because the mean of its divisors is an integer number (330406494).

Almost surely, 2^1981408119 is an apocalyptic number.

1981408119 is a deficient number, since it is larger than the sum of its proper divisors (661843833).

1981408119 is a wasteful number, since it uses less digits than its factorization.

1981408119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343617.

The product of its (nonzero) digits is 20736, while the sum is 42.

The square root of 1981408119 is about 44513.0106710386. The cubic root of 1981408119 is about 1256.0048393849.

The spelling of 1981408119 in words is "one billion, nine hundred eighty-one million, four hundred eight thousand, one hundred nineteen".