1210820 has 24 divisors (see below), whose sum is σ = 2738904. Its totient is φ = 446976.

The previous prime is 1210819. The next prime is 1210831. The reversal of 1210820 is 280121.

It can be written as a sum of positive squares in 4 ways, for example, as 9604 + 1201216 = 98^2 + 1096^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1210795 and 1210804.

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, 2069 + ... + 2588.

It is an arithmetic number, because the mean of its divisors is an integer number (114121).

2^1210820 is an apocalyptic number.

1210820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210820 is an abundant number, since it is smaller than the sum of its proper divisors (1528084).

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

1210820 is a wasteful number, since it uses less digits than its factorization.

1210820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4679 (or 4677 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1210820 is about 1100.3726641461. The cubic root of 1210820 is about 106.5842896966.

Adding to 1210820 its reverse (280121), we get a palindrome (1490941).

The spelling of 1210820 in words is "one million, two hundred ten thousand, eight hundred twenty".