189139445 has 16 divisors (see below), whose sum is σ = 247943808. Its totient is φ = 137365440.

The previous prime is 189139441. The next prime is 189139477. The reversal of 189139445 is 544931981.

189139445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 189139445 - 2² = 189139441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 189139396 and 189139405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189139441) 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, 46847 + ... + 50723.

It is an arithmetic number, because the mean of its divisors is an integer number (15496488).

Almost surely, 2^189139445 is an apocalyptic number.

It is an amenable number.

189139445 is a deficient number, since it is larger than the sum of its proper divisors (58804363).

189139445 is a wasteful number, since it uses less digits than its factorization.

189139445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4780.

The product of its digits is 155520, while the sum is 44.

The square root of 189139445 is about 13752.7977153741. The cubic root of 189139445 is about 574.0204570078.

The spelling of 189139445 in words is "one hundred eighty-nine million, one hundred thirty-nine thousand, four hundred forty-five".