190198638 has 128 divisors (see below), whose sum is σ = 510935040. Its totient is φ = 51274080.

The previous prime is 190198633. The next prime is 190198643. The reversal of 190198638 is 836891091.

190198638 is a `hidden beast` number, since 1 + 9 + 0 + 1 + 9 + 8 + 638 = 666.

It is an interprime number because it is at equal distance from previous prime (190198633) and next prime (190198643).

It is a junction number, because it is equal to n+sod(n) for n = 190198593 and 190198602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190198633) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1138831 + ... + 1138997.

It is an arithmetic number, because the mean of its divisors is an integer number (3991680).

Almost surely, 2^190198638 is an apocalyptic number.

190198638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 190198638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255467520).

190198638 is an abundant number, since it is smaller than the sum of its proper divisors (320736402).

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

190198638 is a wasteful number, since it uses less digits than its factorization.

190198638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339 (or 333 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The square root of 190198638 is about 13791.2522274085. The cubic root of 190198638 is about 575.0899801214.

The spelling of 190198638 in words is "one hundred ninety million, one hundred ninety-eight thousand, six hundred thirty-eight".