2243657 has 4 divisors (see below), whose sum is σ = 2416260. Its totient is φ = 2071056.

The previous prime is 2243623. The next prime is 2243663. The reversal of 2243657 is 7563422.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7563422 = 2 ⋅3781711.

It can be written as a sum of positive squares in 2 ways, for example, as 1201216 + 1042441 = 1096^2 + 1021^2 .

It is not a de Polignac number, because 2243657 - 2¹² = 2239561 is a prime.

It is a d-powerful number, because it can be written as 2 + 2¹⁹ + 4⁴ + 3¹³ + 6⁶ + 5⁷ + 7 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2243617) 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, 86282 + ... + 86307.

It is an arithmetic number, because the mean of its divisors is an integer number (604065).

2^2243657 is an apocalyptic number.

It is an amenable number.

2243657 is a deficient number, since it is larger than the sum of its proper divisors (172603).

2243657 is a wasteful number, since it uses less digits than its factorization.

2243657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172602.

The product of its digits is 10080, while the sum is 29.

The square root of 2243657 is about 1497.8841744274. The cubic root of 2243657 is about 130.9138177978.

The spelling of 2243657 in words is "two million, two hundred forty-three thousand, six hundred fifty-seven".