1609398 has 48 divisors (see below), whose sum is σ = 4077216. Its totient is φ = 449280.

The previous prime is 1609381. The next prime is 1609403. The reversal of 1609398 is 8939061.

It is a d-powerful number, because it can be written as 1 + 6⁵ + 0 + 9³ + 3¹³ + 9⁴ + 8 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6558 + ... + 6798.

It is an arithmetic number, because the mean of its divisors is an integer number (84942).

2^1609398 is an apocalyptic number.

1609398 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1609398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2038608).

1609398 is an abundant number, since it is smaller than the sum of its proper divisors (2467818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1609398 is a wasteful number, since it uses less digits than its factorization.

1609398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1609398 is about 1268.6205106335. The cubic root of 1609398 is about 117.1892619468.

The spelling of 1609398 in words is "one million, six hundred nine thousand, three hundred ninety-eight".