1973638 has 4 divisors (see below), whose sum is σ = 2960460. Its totient is φ = 986818.

The previous prime is 1973633. The next prime is 1973651. The reversal of 1973638 is 8363791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8363791 = 47 ⋅177953.

It is a junction number, because it is equal to n+sod(n) for n = 1973597 and 1973606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1973633) 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, 493408 + ... + 493411.

It is an arithmetic number, because the mean of its divisors is an integer number (740115).

2^1973638 is an apocalyptic number.

1973638 is a deficient number, since it is larger than the sum of its proper divisors (986822).

1973638 is an equidigital number, since it uses as much as digits as its factorization.

1973638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986821.

The product of its digits is 27216, while the sum is 37.

The square root of 1973638 is about 1404.8622708294. The cubic root of 1973638 is about 125.4360875189.

The spelling of 1973638 in words is "one million, nine hundred seventy-three thousand, six hundred thirty-eight".