189730 has 8 divisors (see below), whose sum is σ = 341532. Its totient is φ = 75888.

The previous prime is 189713. The next prime is 189733. The reversal of 189730 is 37981.

189730 = T₃₀₆ + T₃₀₇ + ... + T₃₀₉.

189730 = 24² + 25² + ... + 83².

It can be written as a sum of positive squares in 2 ways, for example, as 185761 + 3969 = 431^2 + 63^2 .

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

It is not an unprimeable number, because it can be changed into a prime (189733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9477 + ... + 9496.

2¹⁸⁹⁷³⁰ is an apocalyptic number.

189730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189730 is a deficient number, since it is larger than the sum of its proper divisors (151802).

189730 is a wasteful number, since it uses less digits than its factorization.

189730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18980.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 189730 is about 435.5800730061. The cubic root of 189730 is about 57.4617262623.

It can be divided in two parts, 189 and 730, that added together give a palindrome (919).

The spelling of 189730 in words is "one hundred eighty-nine thousand, seven hundred thirty".