189117428 has 6 divisors (see below), whose sum is σ = 330955506. Its totient is φ = 94558712.

The previous prime is 189117427. The next prime is 189117433. The reversal of 189117428 is 824711981.

It can be written as a sum of positive squares in only one way, i.e., 177475684 + 11641744 = 13322^2 + 3412^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189117421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23639675 + ... + 23639682.

It is an arithmetic number, because the mean of its divisors is an integer number (55159251).

Almost surely, 2^189117428 is an apocalyptic number.

It is an amenable number.

189117428 is a deficient number, since it is larger than the sum of its proper divisors (141838078).

189117428 is a wasteful number, since it uses less digits than its factorization.

189117428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47279361 (or 47279359 counting only the distinct ones).

The product of its digits is 32256, while the sum is 41.

The square root of 189117428 is about 13751.9972367653. The cubic root of 189117428 is about 573.9981829676.

The spelling of 189117428 in words is "one hundred eighty-nine million, one hundred seventeen thousand, four hundred twenty-eight".