1975642 has 4 divisors (see below), whose sum is σ = 2963466. Its totient is φ = 987820.

The previous prime is 1975627. The next prime is 1975651. The reversal of 1975642 is 2465791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2465791 = 37 ⋅66643.

It can be written as a sum of positive squares in only one way, i.e., 1234321 + 741321 = 1111^2 + 861^2 .

It is a super-2 number, since 2×1975642² = 7806322624328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1975598 and 1975607.

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 as a sum of consecutive naturals, namely, 493909 + ... + 493912.

2^1975642 is an apocalyptic number.

1975642 is a deficient number, since it is larger than the sum of its proper divisors (987824).

1975642 is an equidigital number, since it uses as much as digits as its factorization.

1975642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 987823.

The product of its digits is 15120, while the sum is 34.

The square root of 1975642 is about 1405.5753270458. The cubic root of 1975642 is about 125.4785284135.

The spelling of 1975642 in words is "one million, nine hundred seventy-five thousand, six hundred forty-two".