189478549 has 8 divisors (see below), whose sum is σ = 216057240. Its totient is φ = 164614656.

The previous prime is 189478537. The next prime is 189478561. The reversal of 189478549 is 945874981.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (189478537) and next prime (189478561).

It can be written as a sum of positive squares in 4 ways, for example, as 10400625 + 179077924 = 3225^2 + 13382^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 189478549 - 2¹¹ = 189476501 is a prime.

It is a super-2 number, since 2×189478549² = 71804241062290802, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 189478549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189478519) 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, 428464 + ... + 428905.

It is an arithmetic number, because the mean of its divisors is an integer number (27007155).

Almost surely, 2^189478549 is an apocalyptic number.

It is an amenable number.

189478549 is a deficient number, since it is larger than the sum of its proper divisors (26578691).

189478549 is a wasteful number, since it uses less digits than its factorization.

189478549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857399.

The product of its digits is 2903040, while the sum is 55.

The square root of 189478549 is about 13765.1207404803. The cubic root of 189478549 is about 574.3633017968.

The spelling of 189478549 in words is "one hundred eighty-nine million, four hundred seventy-eight thousand, five hundred forty-nine".