1618985 has 4 divisors (see below), whose sum is σ = 1942788. Its totient is φ = 1295184.

The previous prime is 1618979. The next prime is 1619021. The reversal of 1618985 is 5898161.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1281424 + 337561 = 1132^2 + 581^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1618985 is a prime.

It is a super-2 number, since 2×1618985² = 5242224860450, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161894 + ... + 161903.

It is an arithmetic number, because the mean of its divisors is an integer number (485697).

2^1618985 is an apocalyptic number.

It is an amenable number.

1618985 is a deficient number, since it is larger than the sum of its proper divisors (323803).

1618985 is an equidigital number, since it uses as much as digits as its factorization.

1618985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323802.

The product of its digits is 17280, while the sum is 38.

The square root of 1618985 is about 1272.3934140037. The cubic root of 1618985 is about 117.4214957732.

The spelling of 1618985 in words is "one million, six hundred eighteen thousand, nine hundred eighty-five".