198520815 has 16 divisors (see below), whose sum is σ = 336318048. Its totient is φ = 99649536.

The previous prime is 198520813. The next prime is 198520823. The reversal of 198520815 is 518025891.

It is not a de Polignac number, because 198520815 - 2¹ = 198520813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198520813) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 389002 + ... + 389511.

It is an arithmetic number, because the mean of its divisors is an integer number (21019878).

Almost surely, 2^198520815 is an apocalyptic number.

198520815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

198520815 is a deficient number, since it is larger than the sum of its proper divisors (137797233).

198520815 is a wasteful number, since it uses less digits than its factorization.

198520815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778538.

The product of its (nonzero) digits is 28800, while the sum is 39.

The square root of 198520815 is about 14089.7414809499. The cubic root of 198520815 is about 583.3582576198.

The spelling of 198520815 in words is "one hundred ninety-eight million, five hundred twenty thousand, eight hundred fifteen".