642965 has 8 divisors (see below), whose sum is σ = 805248. Its totient is φ = 491920.

The previous prime is 642953. The next prime is 642973. The reversal of 642965 is 569246.

642965 = 10² + 11² + ... + 124².

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

It is not a de Polignac number, because 642965 - 2¹⁴ = 626581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2681 + ... + 2910.

It is an arithmetic number, because the mean of its divisors is an integer number (100656).

2⁶⁴²⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

642965 is a deficient number, since it is larger than the sum of its proper divisors (162283).

642965 is a wasteful number, since it uses less digits than its factorization.

642965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5619.

The product of its digits is 12960, while the sum is 32.

The square root of 642965 is about 801.8509836622. The cubic root of 642965 is about 86.3102638413.

The spelling of 642965 in words is "six hundred forty-two thousand, nine hundred sixty-five".