1828621 has 4 divisors (see below), whose sum is σ = 1832512. Its totient is φ = 1824732.

The previous prime is 1828609. The next prime is 1828627. The reversal of 1828621 is 1268281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1268281 = 7 ⋅181183.

It is a cyclic number.

It is not a de Polignac number, because 1828621 - 2¹⁵ = 1795853 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1828621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1828627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1125 + ... + 2218.

It is an arithmetic number, because the mean of its divisors is an integer number (458128).

2^1828621 is an apocalyptic number.

It is an amenable number.

1828621 is a deficient number, since it is larger than the sum of its proper divisors (3891).

1828621 is an equidigital number, since it uses as much as digits as its factorization.

1828621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3890.

The product of its digits is 1536, while the sum is 28.

The square root of 1828621 is about 1352.2651367243. The cubic root of 1828621 is about 122.2853885000.

The spelling of 1828621 in words is "one million, eight hundred twenty-eight thousand, six hundred twenty-one".