1601818 has 4 divisors (see below), whose sum is σ = 2402730. Its totient is φ = 800908.

The previous prime is 1601813. The next prime is 1601843. The reversal of 1601818 is 8181061.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1338649 + 263169 = 1157^2 + 513^2 .

1601818 is a modest number, since divided by 1818 gives 160 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1601792 and 1601801.

It is not an unprimeable number, because it can be changed into a prime (1601813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400453 + ... + 400456.

2^1601818 is an apocalyptic number.

1601818 is a deficient number, since it is larger than the sum of its proper divisors (800912).

1601818 is an equidigital number, since it uses as much as digits as its factorization.

1601818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800911.

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 1601818 is about 1265.6294876464. The cubic root of 1601818 is about 117.0049916296.

Adding to 1601818 its reverse (8181061), we get a palindrome (9782879).

The spelling of 1601818 in words is "one million, six hundred one thousand, eight hundred eighteen".