1021818 has 16 divisors (see below), whose sum is σ = 2335680. Its totient is φ = 291936.

The previous prime is 1021807. The next prime is 1021831. The reversal of 1021818 is 8181201.

It is a super-2 number, since 2×1021818² = 2088224050248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

1021818 is a modest number, since divided by 1818 gives 102 as remainder.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1021794 and 1021803.

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, 12123 + ... + 12206.

It is an arithmetic number, because the mean of its divisors is an integer number (145980).

2^1021818 is an apocalyptic number.

1021818 is an abundant number, since it is smaller than the sum of its proper divisors (1313862).

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

1021818 is a wasteful number, since it uses less digits than its factorization.

1021818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24341.

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 1021818 is about 1010.8501372607. The cubic root of 1021818 is about 100.7220406914.

The spelling of 1021818 in words is "one million, twenty-one thousand, eight hundred eighteen".