642465 has 16 divisors (see below), whose sum is σ = 1142400. Its totient is φ = 342576.

The previous prime is 642457. The next prime is 642487. The reversal of 642465 is 564246.

It is a happy number.

642465 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 642465 - 2³ = 642457 is a prime.

It is a super-2 number, since 2×642465² = 825522552450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

642465 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642465.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2245 + ... + 2514.

It is an arithmetic number, because the mean of its divisors is an integer number (71400).

2⁶⁴²⁴⁶⁵ is an apocalyptic number.

It is an amenable number.

642465 is a deficient number, since it is larger than the sum of its proper divisors (499935).

642465 is a wasteful number, since it uses less digits than its factorization.

642465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4773 (or 4767 counting only the distinct ones).

The product of its digits is 5760, while the sum is 27.

The square root of 642465 is about 801.5391443966. The cubic root of 642465 is about 86.2878850580.

The spelling of 642465 in words is "six hundred forty-two thousand, four hundred sixty-five".