1821538 has 8 divisors (see below), whose sum is σ = 2743488. Its totient is φ = 907044.

The previous prime is 1821509. The next prime is 1821541. The reversal of 1821538 is 8351281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1206 + ... + 2257.

It is an arithmetic number, because the mean of its divisors is an integer number (342936).

2^1821538 is an apocalyptic number.

1821538 is a deficient number, since it is larger than the sum of its proper divisors (921950).

1821538 is a wasteful number, since it uses less digits than its factorization.

1821538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3728.

The product of its digits is 1920, while the sum is 28.

The square root of 1821538 is about 1349.6436566739. The cubic root of 1821538 is about 122.1272970321.

The spelling of 1821538 in words is "one million, eight hundred twenty-one thousand, five hundred thirty-eight".