191142738 has 24 divisors (see below), whose sum is σ = 424245276. Its totient is φ = 62160000.

The previous prime is 191142737. The next prime is 191142769. The reversal of 191142738 is 837241191.

It is a happy number.

191142738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 189695529 + 1447209 = 13773^2 + 1203^2 .

It is not an unprimeable number, because it can be changed into a prime (191142733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 128763 + ... + 130238.

Almost surely, 2^191142738 is an apocalyptic number.

191142738 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

191142738 is an abundant number, since it is smaller than the sum of its proper divisors (233102538).

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

191142738 is a wasteful number, since it uses less digits than its factorization.

191142738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259050 (or 259047 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 191142738 is about 13825.4380762419. The cubic root of 191142738 is about 576.0399458697.

The spelling of 191142738 in words is "one hundred ninety-one million, one hundred forty-two thousand, seven hundred thirty-eight".