1975638 has 32 divisors (see below), whose sum is σ = 4783104. Its totient is φ = 531072.

The previous prime is 1975627. The next prime is 1975651. The reversal of 1975638 is 8365791.

It is a junction number, because it is equal to n+sod(n) for n = 1975596 and 1975605.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 670 + ... + 2097.

It is an arithmetic number, because the mean of its divisors is an integer number (149472).

2^1975638 is an apocalyptic number.

1975638 is an abundant number, since it is smaller than the sum of its proper divisors (2807466).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1975638 is a wasteful number, since it uses less digits than its factorization.

1975638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2796.

The product of its digits is 45360, while the sum is 39.

The square root of 1975638 is about 1405.5739041402. The cubic root of 1975638 is about 125.4784437297.

It can be divided in two parts, 19 and 75638, that added together give a palindrome (75657).

The spelling of 1975638 in words is "one million, nine hundred seventy-five thousand, six hundred thirty-eight".