1974509 has 4 divisors (see below), whose sum is σ = 2006940. Its totient is φ = 1942080.

The previous prime is 1974503. The next prime is 1974541. The reversal of 1974509 is 9054791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9054791 = 487 ⋅18593.

It can be written as a sum of positive squares in 2 ways, for example, as 75625 + 1898884 = 275^2 + 1378^2 .

It is a cyclic number.

It is not a de Polignac number, because 1974509 - 2⁴ = 1974493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1974503) 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 3 ways as a sum of consecutive naturals, for example, 16124 + ... + 16245.

It is an arithmetic number, because the mean of its divisors is an integer number (501735).

2^1974509 is an apocalyptic number.

It is an amenable number.

1974509 is a deficient number, since it is larger than the sum of its proper divisors (32431).

1974509 is an equidigital number, since it uses as much as digits as its factorization.

1974509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32430.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 1974509 is about 1405.1722314364. The cubic root of 1974509 is about 125.4545371643.

The spelling of 1974509 in words is "one million, nine hundred seventy-four thousand, five hundred nine".