198381915 has 48 divisors (see below), whose sum is σ = 352864512. Its totient is φ = 103064832.

The previous prime is 198381913. The next prime is 198381917. The reversal of 198381915 is 519183891.

It is an interprime number because it is at equal distance from previous prime (198381913) and next prime (198381917).

It is not a de Polignac number, because 198381915 - 2¹ = 198381913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (198381913) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 531669 + ... + 532041.

It is an arithmetic number, because the mean of its divisors is an integer number (7351344).

Almost surely, 2^198381915 is an apocalyptic number.

198381915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

198381915 is a deficient number, since it is larger than the sum of its proper divisors (154482597).

198381915 is a wasteful number, since it uses less digits than its factorization.

198381915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660 (or 657 counting only the distinct ones).

The product of its digits is 77760, while the sum is 45.

The square root of 198381915 is about 14084.8115003361. The cubic root of 198381915 is about 583.2221721969. Note that the first 3 decimals are identical.

The spelling of 198381915 in words is "one hundred ninety-eight million, three hundred eighty-one thousand, nine hundred fifteen".