1821394 has 8 divisors (see below), whose sum is σ = 2795760. Its totient is φ = 889476.

The previous prime is 1821377. The next prime is 1821401. The reversal of 1821394 is 4931281.

It is a happy number.

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

It is a super-2 number, since 2×1821394² = 6634952206472, which contains 22 as substring.

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, 10504 + ... + 10675.

It is an arithmetic number, because the mean of its divisors is an integer number (349470).

2^1821394 is an apocalyptic number.

1821394 is a deficient number, since it is larger than the sum of its proper divisors (974366).

1821394 is a wasteful number, since it uses less digits than its factorization.

1821394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21224.

The product of its digits is 1728, while the sum is 28.

The square root of 1821394 is about 1349.5903082047. The cubic root of 1821394 is about 122.1240787272.

It can be divided in two parts, 18 and 21394, that added together give a palindrome (21412).

The spelling of 1821394 in words is "one million, eight hundred twenty-one thousand, three hundred ninety-four".