1618220 has 12 divisors (see below), whose sum is σ = 3398304. Its totient is φ = 647280.

The previous prime is 1618217. The next prime is 1618223. The reversal of 1618220 is 228161.

It is an interprime number because it is at equal distance from previous prime (1618217) and next prime (1618223).

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 80911 = 1618220 / (1 + 6 + 1 + 8 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 1618192 and 1618201.

It is not an unprimeable number, because it can be changed into a prime (1618223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40436 + ... + 40475.

It is an arithmetic number, because the mean of its divisors is an integer number (283192).

2^1618220 is an apocalyptic number.

1618220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1618220 is an abundant number, since it is smaller than the sum of its proper divisors (1780084).

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

1618220 is a wasteful number, since it uses less digits than its factorization.

1618220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80920 (or 80918 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 1618220 is about 1272.0927639131. The cubic root of 1618220 is about 117.4029982585.

The spelling of 1618220 in words is "one million, six hundred eighteen thousand, two hundred twenty".