2042309 has 4 divisors (see below), whose sum is σ = 2061504. Its totient is φ = 2023116.

The previous prime is 2042303. The next prime is 2042317. The reversal of 2042309 is 9032402.

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: 9032402 = 2 ⋅4516201.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2042309 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2042303) 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, 9437 + ... + 9650.

It is an arithmetic number, because the mean of its divisors is an integer number (515376).

2^2042309 is an apocalyptic number.

It is an amenable number.

2042309 is a deficient number, since it is larger than the sum of its proper divisors (19195).

2042309 is a wasteful number, since it uses less digits than its factorization.

2042309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19194.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 2042309 is about 1429.0937687920. The cubic root of 2042309 is about 126.8743461346.

The spelling of 2042309 in words is "two million, forty-two thousand, three hundred nine".