642089 has 8 divisors (see below), whose sum is σ = 759360. Its totient is φ = 531216.

The previous prime is 642079. The next prime is 642113. The reversal of 642089 is 980246.

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

It is not a de Polignac number, because 642089 - 2⁸ = 641833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is an Ulam number.

It is a d-powerful number, because it can be written as 6⁷ + 4⁹ + 0 + 2¹³ + 8⁵ + 9⁵ .

It is not an unprimeable number, because it can be changed into a prime (642049) 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, 1379 + ... + 1784.

It is an arithmetic number, because the mean of its divisors is an integer number (94920).

2⁶⁴²⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

642089 is a deficient number, since it is larger than the sum of its proper divisors (117271).

642089 is a wasteful number, since it uses less digits than its factorization.

642089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3199.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 642089 is about 801.3045613248. The cubic root of 642089 is about 86.2710485631.

The spelling of 642089 in words is "six hundred forty-two thousand, eighty-nine".