1642109 has 4 divisors (see below), whose sum is σ = 1876704. Its totient is φ = 1407516.

The previous prime is 1642093. The next prime is 1642117. The reversal of 1642109 is 9012461.

It is a happy number.

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: 9012461 = 1997 ⋅4513.

It is a cyclic number.

It is not a de Polignac number, because 1642109 - 2⁴ = 1642093 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 (1642309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117287 + ... + 117300.

It is an arithmetic number, because the mean of its divisors is an integer number (469176).

2^1642109 is an apocalyptic number.

It is an amenable number.

1642109 is a deficient number, since it is larger than the sum of its proper divisors (234595).

1642109 is an equidigital number, since it uses as much as digits as its factorization.

1642109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234594.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1642109 is about 1281.4480090897. The cubic root of 1642109 is about 117.9778997201.

The spelling of 1642109 in words is "one million, six hundred forty-two thousand, one hundred nine".