198691542 has 80 divisors (see below), whose sum is σ = 515192832. Its totient is φ = 56058480.

The previous prime is 198691489. The next prime is 198691547. The reversal of 198691542 is 245196891.

198691542 is a `hidden beast` number, since 19 + 8 + 6 + 91 + 542 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198691547) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 93067 + ... + 95177.

Almost surely, 2^198691542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 198691542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (257596416).

198691542 is an abundant number, since it is smaller than the sum of its proper divisors (316501290).

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

198691542 is a wasteful number, since it uses less digits than its factorization.

198691542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215 (or 2206 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 198691542 is about 14095.7987357936. The cubic root of 198691542 is about 583.5254381889.

It can be divided in two parts, 1986 and 91542, that added together give a triangular number (93528 = T₄₃₂).

The spelling of 198691542 in words is "one hundred ninety-eight million, six hundred ninety-one thousand, five hundred forty-two".