1642009 has 8 divisors (see below), whose sum is σ = 1741320. Its totient is φ = 1545600.

The previous prime is 1641971. The next prime is 1642021. The reversal of 1642009 is 9002461.

It can be written as a sum of positive squares in 4 ways, for example, as 16384 + 1625625 = 128^2 + 1275^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1642009 - 2⁷ = 1641881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1642049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 499 + ... + 1879.

It is an arithmetic number, because the mean of its divisors is an integer number (217665).

2^1642009 is an apocalyptic number.

It is an amenable number.

1642009 is a deficient number, since it is larger than the sum of its proper divisors (99311).

1642009 is a wasteful number, since it uses less digits than its factorization.

1642009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1451.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1642009 is about 1281.4089901355. The cubic root of 1642009 is about 117.9755048264.

It can be divided in two parts, 164 and 2009, that multiplied together give a square (329476 = 574²).

The spelling of 1642009 in words is "one million, six hundred forty-two thousand, nine".