1608981 has 8 divisors (see below), whose sum is σ = 2340384. Its totient is φ = 975120.

The previous prime is 1608979. The next prime is 1609009. The reversal of 1608981 is 1898061.

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

It is not a de Polignac number, because 1608981 - 2¹ = 1608979 is a prime.

It is a super-2 number, since 2×1608981² = 5177639716722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 48757 = 1608981 / (1 + 6 + 0 + 8 + 9 + 8 + 1).

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1608911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24346 + ... + 24411.

It is an arithmetic number, because the mean of its divisors is an integer number (292548).

2^1608981 is an apocalyptic number.

1608981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1608981 is a deficient number, since it is larger than the sum of its proper divisors (731403).

1608981 is a wasteful number, since it uses less digits than its factorization.

1608981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48771.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 1608981 is about 1268.4561482369. The cubic root of 1608981 is about 117.1791397058.

The spelling of 1608981 in words is "one million, six hundred eight thousand, nine hundred eighty-one".