642499 has 8 divisors (see below), whose sum is σ = 754992. Its totient is φ = 539040.

The previous prime is 642487. The next prime is 642517. The reversal of 642499 is 994246.

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 642499 - 2¹³ = 634307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2104 + ... + 2389.

It is an arithmetic number, because the mean of its divisors is an integer number (94374).

2⁶⁴²⁴⁹⁹ is an apocalyptic number.

642499 is a deficient number, since it is larger than the sum of its proper divisors (112493).

642499 is a wasteful number, since it uses less digits than its factorization.

642499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4517.

The product of its digits is 15552, while the sum is 34.

The square root of 642499 is about 801.5603533110. The cubic root of 642499 is about 86.2894071831.

The spelling of 642499 in words is "six hundred forty-two thousand, four hundred ninety-nine".