2238521 has 4 divisors (see below), whose sum is σ = 2335872. Its totient is φ = 2141172.

The previous prime is 2238491. The next prime is 2238527. The reversal of 2238521 is 1258322.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2238521 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 97327 = 2238521 / (2 + 2 + 3 + 8 + 5 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2238527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48641 + ... + 48686.

It is an arithmetic number, because the mean of its divisors is an integer number (583968).

2^2238521 is an apocalyptic number.

It is an amenable number.

2238521 is a deficient number, since it is larger than the sum of its proper divisors (97351).

2238521 is an equidigital number, since it uses as much as digits as its factorization.

2238521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97350.

The product of its digits is 960, while the sum is 23.

The square root of 2238521 is about 1496.1687739022. The cubic root of 2238521 is about 130.8138490014.

The spelling of 2238521 in words is "two million, two hundred thirty-eight thousand, five hundred twenty-one".