189740284438 has 4 divisors (see below), whose sum is σ = 284610426660. Its totient is φ = 94870142218.

The previous prime is 189740284361. The next prime is 189740284457. The reversal of 189740284438 is 834482047981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 834482047981 = 17 ⋅49087179293.

It is a super-2 number, since 2×189740284438² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47435071108 + ... + 47435071111.

It is an arithmetic number, because the mean of its divisors is an integer number (71152606665).

Almost surely, 2^189740284438 is an apocalyptic number.

189740284438 is a deficient number, since it is larger than the sum of its proper divisors (94870142222).

189740284438 is an equidigital number, since it uses as much as digits as its factorization.

189740284438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94870142221.

The product of its (nonzero) digits is 12386304, while the sum is 58.

The spelling of 189740284438 in words is "one hundred eighty-nine billion, seven hundred forty million, two hundred eighty-four thousand, four hundred thirty-eight".