198921015 has 48 divisors (see below), whose sum is σ = 361329696. Its totient is φ = 104976000.

The previous prime is 198921007. The next prime is 198921049. The reversal of 198921015 is 510129891.

It is not a de Polignac number, because 198921015 - 2³ = 198921007 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 121905 + ... + 123525.

It is an arithmetic number, because the mean of its divisors is an integer number (7527702).

Almost surely, 2^198921015 is an apocalyptic number.

198921015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

198921015 is a deficient number, since it is larger than the sum of its proper divisors (162408681).

198921015 is a wasteful number, since it uses less digits than its factorization.

198921015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1742 (or 1730 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The square root of 198921015 is about 14103.9361527199. The cubic root of 198921015 is about 583.7499936570.

The spelling of 198921015 in words is "one hundred ninety-eight million, nine hundred twenty-one thousand, fifteen".