1821416 has 32 divisors (see below), whose sum is σ = 3758400. Its totient is φ = 823680.

The previous prime is 1821409. The next prime is 1821427. The reversal of 1821416 is 6141281.

1821416 = 150² + 151² + ... + 206².

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 1821391 and 1821400.

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, 3236 + ... + 3756.

It is an arithmetic number, because the mean of its divisors is an integer number (117450).

2^1821416 is an apocalyptic number.

It is an amenable number.

1821416 is an abundant number, since it is smaller than the sum of its proper divisors (1936984).

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

1821416 is a wasteful number, since it uses less digits than its factorization.

1821416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569 (or 565 counting only the distinct ones).

The product of its digits is 384, while the sum is 23.

The square root of 1821416 is about 1349.5984588017. The cubic root of 1821416 is about 122.1245704236.

Adding to 1821416 its reverse (6141281), we get a palindrome (7962697).

The spelling of 1821416 in words is "one million, eight hundred twenty-one thousand, four hundred sixteen".