191057388 has 48 divisors (see below), whose sum is σ = 470373120. Its totient is φ = 60191424.

The previous prime is 191057387. The next prime is 191057393. The reversal of 191057388 is 883750191.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (191057387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139081 + ... + 140447.

It is an arithmetic number, because the mean of its divisors is an integer number (9799440).

Almost surely, 2^191057388 is an apocalyptic number.

It is an amenable number.

191057388 is an abundant number, since it is smaller than the sum of its proper divisors (279315732).

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

191057388 is a wasteful number, since it uses less digits than its factorization.

191057388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2006 (or 2004 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 42.

The square root of 191057388 is about 13822.3510301251. The cubic root of 191057388 is about 575.9541943706.

The spelling of 191057388 in words is "one hundred ninety-one million, fifty-seven thousand, three hundred eighty-eight".