2473821 has 20 divisors (see below), whose sum is σ = 4224352. Its totient is φ = 1413288.

The previous prime is 2473813. The next prime is 2473837. The reversal of 2473821 is 1283742.

It is not a de Polignac number, because 2473821 - 2³ = 2473813 is a prime.

It is a super-2 number, since 2×2473821² = 12239580680082, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a d-powerful number, because it can be written as 2¹⁷ + 4⁸ + 7⁴ + 3¹¹ + 8³ + 2²¹ + 1 .

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2473871) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1615 + ... + 2748.

2^2473821 is an apocalyptic number.

2473821 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2473821 is a deficient number, since it is larger than the sum of its proper divisors (1750531).

2473821 is an equidigital number, since it uses as much as digits as its factorization.

2473821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4382 (or 4373 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 2473821 is about 1572.8385168224. The cubic root of 2473821 is about 135.2454792844.

The spelling of 2473821 in words is "two million, four hundred seventy-three thousand, eight hundred twenty-one".