191345638 has 16 divisors (see below), whose sum is σ = 314110224. Its totient is φ = 86697760.

The previous prime is 191345633. The next prime is 191345641. The reversal of 191345638 is 836543191.

It is a super-2 number, since 2×191345638² = 73226306363254088, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 191345638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191345633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6745 + ... + 20692.

It is an arithmetic number, because the mean of its divisors is an integer number (19631889).

Almost surely, 2^191345638 is an apocalyptic number.

191345638 is a deficient number, since it is larger than the sum of its proper divisors (122764586).

191345638 is a wasteful number, since it uses less digits than its factorization.

191345638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27767.

The product of its digits is 77760, while the sum is 40.

The square root of 191345638 is about 13832.7740529512. The cubic root of 191345638 is about 576.2436979186.

The spelling of 191345638 in words is "one hundred ninety-one million, three hundred forty-five thousand, six hundred thirty-eight".