642459 has 8 divisors (see below), whose sum is σ = 893952. Its totient is φ = 409640.

The previous prime is 642457. The next prime is 642487. The reversal of 642459 is 954246.

642459 = 156² + 157² + ... + 178².

642459 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

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 642459 - 2¹ = 642457 is a prime.

642459 is strictly pandigital in base 7.

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 642459.

It is not an unprimeable number, because it can be changed into a prime (642457) 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, 4587 + ... + 4724.

It is an arithmetic number, because the mean of its divisors is an integer number (111744).

2⁶⁴²⁴⁵⁹ is an apocalyptic number.

642459 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

642459 is a deficient number, since it is larger than the sum of its proper divisors (251493).

642459 is a wasteful number, since it uses less digits than its factorization.

642459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9337.

The product of its digits is 8640, while the sum is 30.

The square root of 642459 is about 801.5354015887. The cubic root of 642459 is about 86.2876164421.

The spelling of 642459 in words is "six hundred forty-two thousand, four hundred fifty-nine".