189406636742 has 4 divisors (see below), whose sum is σ = 284109955116. Its totient is φ = 94703318370.

The previous prime is 189406636729. The next prime is 189406636763. The reversal of 189406636742 is 247636604981.

It is a semiprime because it is the product of two primes.

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, 47351659184 + ... + 47351659187.

It is an arithmetic number, because the mean of its divisors is an integer number (71027488779).

Almost surely, 2^189406636742 is an apocalyptic number.

189406636742 is a deficient number, since it is larger than the sum of its proper divisors (94703318374).

189406636742 is an equidigital number, since it uses as much as digits as its factorization.

189406636742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94703318373.

The product of its (nonzero) digits is 10450944, while the sum is 56.

The spelling of 189406636742 in words is "one hundred eighty-nine billion, four hundred six million, six hundred thirty-six thousand, seven hundred forty-two".