191638152 has 24 divisors (see below), whose sum is σ = 519020190. Its totient is φ = 63879360.

The previous prime is 191638103. The next prime is 191638163. The reversal of 191638152 is 251836191.

191638152 is a `hidden beast` number, since 1 + 9 + 1 + 638 + 15 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 145588356 + 46049796 = 12066^2 + 6786^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1330749 + ... + 1330892.

Almost surely, 2^191638152 is an apocalyptic number.

191638152 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

191638152 is an abundant number, since it is smaller than the sum of its proper divisors (327382038).

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

191638152 is a wasteful number, since it uses less digits than its factorization.

191638152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2661653 (or 2661646 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 191638152 is about 13843.3432378165. The cubic root of 191638152 is about 576.5371869337.

The spelling of 191638152 in words is "one hundred ninety-one million, six hundred thirty-eight thousand, one hundred fifty-two".