198915790 has 8 divisors (see below), whose sum is σ = 358048440. Its totient is φ = 79566312.

The previous prime is 198915779. The next prime is 198915791. The reversal of 198915790 is 97519891.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×198915790² = 79134983022648200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198915791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9945780 + ... + 9945799.

It is an arithmetic number, because the mean of its divisors is an integer number (44756055).

Almost surely, 2^198915790 is an apocalyptic number.

198915790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198915790 is a deficient number, since it is larger than the sum of its proper divisors (159132650).

198915790 is a wasteful number, since it uses less digits than its factorization.

198915790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19891586.

The product of its (nonzero) digits is 204120, while the sum is 49.

The square root of 198915790 is about 14103.7509195249. The cubic root of 198915790 is about 583.7448825489.

The spelling of 198915790 in words is "one hundred ninety-eight million, nine hundred fifteen thousand, seven hundred ninety".