189493490 has 8 divisors (see below), whose sum is σ = 341088300. Its totient is φ = 75797392.

The previous prime is 189493489. The next prime is 189493523. The reversal of 189493490 is 94394981.

It can be written as a sum of positive squares in 2 ways, for example, as 188430529 + 1062961 = 13727^2 + 1031^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9474665 + ... + 9474684.

Almost surely, 2^189493490 is an apocalyptic number.

189493490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

189493490 is a deficient number, since it is larger than the sum of its proper divisors (151594810).

189493490 is a wasteful number, since it uses less digits than its factorization.

189493490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18949356.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 189493490 is about 13765.6634420576. The cubic root of 189493490 is about 574.3783982049.

The spelling of 189493490 in words is "one hundred eighty-nine million, four hundred ninety-three thousand, four hundred ninety".