1975509 has 20 divisors (see below), whose sum is σ = 3056460. Its totient is φ = 1271592.

The previous prime is 1975499. The next prime is 1975511. The reversal of 1975509 is 9055791.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 342225 + 1633284 = 585^2 + 1278^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=3, B=87.

It is not a de Polignac number, because 1975509 - 2⁷ = 1975381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1975529) 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 in 19 ways as a sum of consecutive naturals, for example, 68107 + ... + 68135.

It is an arithmetic number, because the mean of its divisors is an integer number (152823).

2^1975509 is an apocalyptic number.

It is an amenable number.

1975509 is a deficient number, since it is larger than the sum of its proper divisors (1080951).

1975509 is an frugal number, since it uses more digits than its factorization.

1975509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99 (or 32 counting only the distinct ones).

The product of its (nonzero) digits is 14175, while the sum is 36.

The square root of 1975509 is about 1405.5280146621. The cubic root of 1975509 is about 125.4757126167.

The spelling of 1975509 in words is "one million, nine hundred seventy-five thousand, five hundred nine".