1998353387 has 8 divisors (see below), whose sum is σ = 2060002800. Its totient is φ = 1937106144.

The previous prime is 1998353363. The next prime is 1998353389. The reversal of 1998353387 is 7833538991.

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 1998353387 - 2²⁰ = 1997304811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1998353389) 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, 90437 + ... + 110342.

It is an arithmetic number, because the mean of its divisors is an integer number (257500350).

Almost surely, 2^1998353387 is an apocalyptic number.

1998353387 is a deficient number, since it is larger than the sum of its proper divisors (61649413).

1998353387 is a wasteful number, since it uses less digits than its factorization.

1998353387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201085.

The product of its digits is 4898880, while the sum is 56.

The square root of 1998353387 is about 44702.9460662270. The cubic root of 1998353387 is about 1259.5751878974.

The spelling of 1998353387 in words is "one billion, nine hundred ninety-eight million, three hundred fifty-three thousand, three hundred eighty-seven".