1939609 has 4 divisors (see below), whose sum is σ = 2216704. Its totient is φ = 1662516.

The previous prime is 1939603. The next prime is 1939621. The reversal of 1939609 is 9069391.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9069391 = 31 ⋅292561.

It is a cyclic number.

It is not a de Polignac number, because 1939609 - 2⁷ = 1939481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1939603) 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, 138537 + ... + 138550.

It is an arithmetic number, because the mean of its divisors is an integer number (554176).

2^1939609 is an apocalyptic number.

It is an amenable number.

1939609 is a deficient number, since it is larger than the sum of its proper divisors (277095).

1939609 is an equidigital number, since it uses as much as digits as its factorization.

1939609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277094.

The product of its (nonzero) digits is 13122, while the sum is 37.

The square root of 1939609 is about 1392.6984598254. The cubic root of 1939609 is about 124.7109909719.

The spelling of 1939609 in words is "one million, nine hundred thirty-nine thousand, six hundred nine".