198904788 has 24 divisors (see below), whose sum is σ = 515679360. Its totient is φ = 66301560.

The previous prime is 198904763. The next prime is 198904789. The reversal of 198904788 is 887409891.

It is a super-2 number, since 2×198904788² = 79126229378649888, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198904789) 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, 920748 + ... + 920963.

It is an arithmetic number, because the mean of its divisors is an integer number (21486640).

Almost surely, 2^198904788 is an apocalyptic number.

198904788 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

198904788 is an abundant number, since it is smaller than the sum of its proper divisors (316774572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198904788 is a wasteful number, since it uses less digits than its factorization.

198904788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1841724 (or 1841716 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 54.

The square root of 198904788 is about 14103.3608760465. The cubic root of 198904788 is about 583.7341200723.

The spelling of 198904788 in words is "one hundred ninety-eight million, nine hundred four thousand, seven hundred eighty-eight".