1998857141 has 8 divisors (see below), whose sum is σ = 2029795200. Its totient is φ = 1968107680.

The previous prime is 1998857117. The next prime is 1998857143. The reversal of 1998857141 is 1417588991.

It is a happy number.

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 1998857141 - 2²⁶ = 1931748277 is a prime.

It is a super-3 number, since 3×1998857141³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998857143) 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, 25715 + ... + 68256.

It is an arithmetic number, because the mean of its divisors is an integer number (253724400).

Almost surely, 2^1998857141 is an apocalyptic number.

It is an amenable number.

1998857141 is a deficient number, since it is larger than the sum of its proper divisors (30938059).

1998857141 is an equidigital number, since it uses as much as digits as its factorization.

1998857141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94299.

The product of its digits is 725760, while the sum is 53.

The square root of 1998857141 is about 44708.5801720430. The cubic root of 1998857141 is about 1259.6810188169.

The spelling of 1998857141 in words is "one billion, nine hundred ninety-eight million, eight hundred fifty-seven thousand, one hundred forty-one".