2373821 has 2 divisors, whose sum is σ = 2373822. Its totient is φ = 2373820.

The previous prime is 2373773. The next prime is 2373823. The reversal of 2373821 is 1283732.

2373821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1716100 + 657721 = 1310^2 + 811^2 .

It is a cyclic number.

It is not a de Polignac number, because 2373821 - 2¹⁴ = 2357437 is a prime.

It is a super-2 number, since 2×2373821² = 11270052280082, which contains 22 as substring.

Together with 2373823, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is equal to p₁₇₄₅₀₉ and since 2373821 and 174509 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2373823) 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, 1186910 + 1186911.

It is an arithmetic number, because the mean of its divisors is an integer number (1186911).

2^2373821 is an apocalyptic number.

It is an amenable number.

2373821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2373821 is an equidigital number, since it uses as much as digits as its factorization.

2373821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 26.

The square root of 2373821 is about 1540.7209351469. The cubic root of 2373821 is about 133.3980012693.

The spelling of 2373821 in words is "two million, three hundred seventy-three thousand, eight hundred twenty-one".