1609378 has 4 divisors (see below), whose sum is σ = 2414070. Its totient is φ = 804688.

The previous prime is 1609367. The next prime is 1609381. The reversal of 1609378 is 8739061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8739061 = 443 ⋅19727.

It can be written as a sum of positive squares in only one way, i.e., 974169 + 635209 = 987^2 + 797^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402343 + ... + 402346.

2^1609378 is an apocalyptic number.

1609378 is a deficient number, since it is larger than the sum of its proper divisors (804692).

1609378 is an equidigital number, since it uses as much as digits as its factorization.

1609378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804691.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 1609378 is about 1268.6126280311. The cubic root of 1609378 is about 117.1887765076.

The spelling of 1609378 in words is "one million, six hundred nine thousand, three hundred seventy-eight".