1821572 has 6 divisors (see below), whose sum is σ = 3187758. Its totient is φ = 910784.

The previous prime is 1821571. The next prime is 1821583. The reversal of 1821572 is 2751281.

It can be written as a sum of positive squares in only one way, i.e., 1577536 + 244036 = 1256^2 + 494^2 .

It is not an unprimeable number, because it can be changed into a prime (1821571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 227693 + ... + 227700.

It is an arithmetic number, because the mean of its divisors is an integer number (531293).

2^1821572 is an apocalyptic number.

It is an amenable number.

1821572 is a deficient number, since it is larger than the sum of its proper divisors (1366186).

1821572 is a wasteful number, since it uses less digits than its factorization.

1821572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455397 (or 455395 counting only the distinct ones).

The product of its digits is 1120, while the sum is 26.

The square root of 1821572 is about 1349.6562525325. The cubic root of 1821572 is about 122.1280568849.

The spelling of 1821572 in words is "one million, eight hundred twenty-one thousand, five hundred seventy-two".