191895642 has 96 divisors (see below), whose sum is σ = 456228864. Its totient is φ = 60361200.

The previous prime is 191895637. The next prime is 191895701. The reversal of 191895642 is 246598191.

191895642 is a `hidden beast` number, since 1 + 9 + 1 + 89 + 564 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 707967 + ... + 708237.

It is an arithmetic number, because the mean of its divisors is an integer number (4752384).

Almost surely, 2^191895642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191895642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228114432).

191895642 is an abundant number, since it is smaller than the sum of its proper divisors (264333222).

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

191895642 is a wasteful number, since it uses less digits than its factorization.

191895642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366 (or 354 counting only the distinct ones).

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

The square root of 191895642 is about 13852.6402537567. The cubic root of 191895642 is about 576.7952881522.

The spelling of 191895642 in words is "one hundred ninety-one million, eight hundred ninety-five thousand, six hundred forty-two".