1820688 has 40 divisors (see below), whose sum is σ = 4770528. Its totient is φ = 598272.

The previous prime is 1820677. The next prime is 1820699. The reversal of 1820688 is 8860281.

It is an interprime number because it is at equal distance from previous prime (1820677) and next prime (1820699).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3756 + ... + 4212.

2^1820688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1820688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2385264).

1820688 is an abundant number, since it is smaller than the sum of its proper divisors (2949840).

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

1820688 is a wasteful number, since it uses less digits than its factorization.

1820688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551 (or 545 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 1820688 is about 1349.3287219948. The cubic root of 1820688 is about 122.1082976383.

It can be divided in two parts, 18 and 20688, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 1820688 in words is "one million, eight hundred twenty thousand, six hundred eighty-eight".