642299 has 4 divisors (see below), whose sum is σ = 734064. Its totient is φ = 550536.

The previous prime is 642281. The next prime is 642359. The reversal of 642299 is 992246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 992246 = 2 ⋅496123.

It is a de Polignac number, because none of the positive numbers 2^k-642299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45872 + ... + 45885.

It is an arithmetic number, because the mean of its divisors is an integer number (183516).

2⁶⁴²²⁹⁹ is an apocalyptic number.

642299 is a deficient number, since it is larger than the sum of its proper divisors (91765).

642299 is an equidigital number, since it uses as much as digits as its factorization.

642299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91764.

The product of its digits is 7776, while the sum is 32.

The square root of 642299 is about 801.4355869314. The cubic root of 642299 is about 86.2804527347.

The spelling of 642299 in words is "six hundred forty-two thousand, two hundred ninety-nine".