1609728194 has 8 divisors (see below), whose sum is σ = 2416370508. Its totient is φ = 804271360.

The previous prime is 1609728193. The next prime is 1609728233. The reversal of 1609728194 is 4918279061.

It can be written as a sum of positive squares in 2 ways, for example, as 1541583169 + 68145025 = 39263^2 + 8255^2 .

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 (1609728191) 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, 292967 + ... + 298410.

Almost surely, 2^1609728194 is an apocalyptic number.

1609728194 is a deficient number, since it is larger than the sum of its proper divisors (806642314).

1609728194 is a wasteful number, since it uses less digits than its factorization.

1609728194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592740.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 1609728194 is about 40121.4181454245. The cubic root of 1609728194 is about 1171.9727582225.

The spelling of 1609728194 in words is "one billion, six hundred nine million, seven hundred twenty-eight thousand, one hundred ninety-four".