1981904853 has 8 divisors (see below), whose sum is σ = 2665925568. Its totient is φ = 1309577024.

The previous prime is 1981904849. The next prime is 1981904857. The reversal of 1981904853 is 3584091891.

It is an interprime number because it is at equal distance from previous prime (1981904849) and next prime (1981904857).

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 1981904853 - 2² = 1981904849 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981904857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2922825 + ... + 2923502.

It is an arithmetic number, because the mean of its divisors is an integer number (333240696).

Almost surely, 2^1981904853 is an apocalyptic number.

It is an amenable number.

1981904853 is a deficient number, since it is larger than the sum of its proper divisors (684020715).

1981904853 is a wasteful number, since it uses less digits than its factorization.

1981904853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5846443.

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

The square root of 1981904853 is about 44518.5899709324. The cubic root of 1981904853 is about 1256.1097896931.

The spelling of 1981904853 in words is "one billion, nine hundred eighty-one million, nine hundred four thousand, eight hundred fifty-three".