1797638 has 4 divisors (see below), whose sum is σ = 2696460. Its totient is φ = 898818.

The previous prime is 1797637. The next prime is 1797641. The reversal of 1797638 is 8367971.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8367971 = 2297 ⋅3643.

It is a junction number, because it is equal to n+sod(n) for n = 1797595 and 1797604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1797637) 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, 449408 + ... + 449411.

It is an arithmetic number, because the mean of its divisors is an integer number (674115).

2^1797638 is an apocalyptic number.

1797638 is a deficient number, since it is larger than the sum of its proper divisors (898822).

1797638 is an equidigital number, since it uses as much as digits as its factorization.

1797638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898821.

The product of its digits is 63504, while the sum is 41.

The square root of 1797638 is about 1340.7602321071. The cubic root of 1797638 is about 121.5908086168.

The spelling of 1797638 in words is "one million, seven hundred ninety-seven thousand, six hundred thirty-eight".