642369 has 24 divisors (see below), whose sum is σ = 1065792. Its totient is φ = 336960.

The previous prime is 642361. The next prime is 642373. The reversal of 642369 is 963246.

It is not a de Polignac number, because 642369 - 2³ = 642361 is a prime.

It is a super-2 number, since 2×642369² = 825275864322, which contains 22 as substring.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642369.

It is not an unprimeable number, because it can be changed into a prime (642361) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3459 + ... + 3639.

It is an arithmetic number, because the mean of its divisors is an integer number (44408).

2⁶⁴²³⁶⁹ is an apocalyptic number.

It is an amenable number.

642369 is a deficient number, since it is larger than the sum of its proper divisors (423423).

642369 is a wasteful number, since it uses less digits than its factorization.

642369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 204 counting only the distinct ones).

The product of its digits is 7776, while the sum is 30.

The square root of 642369 is about 801.4792573735. The cubic root of 642369 is about 86.2835870031.

The spelling of 642369 in words is "six hundred forty-two thousand, three hundred sixty-nine".