642903 has 8 divisors (see below), whose sum is σ = 902400. Its totient is φ = 406008.

The previous prime is 642899. The next prime is 642907. The reversal of 642903 is 309246.

It is an interprime number because it is at equal distance from previous prime (642899) and next prime (642907).

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

It is not a de Polignac number, because 642903 - 2² = 642899 is a prime.

It is a nialpdrome in base 15.

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 642903.

It is not an unprimeable number, because it can be changed into a prime (642907) 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 7 ways as a sum of consecutive naturals, for example, 5583 + ... + 5696.

It is an arithmetic number, because the mean of its divisors is an integer number (112800).

2⁶⁴²⁹⁰³ is an apocalyptic number.

642903 is a deficient number, since it is larger than the sum of its proper divisors (259497).

642903 is a wasteful number, since it uses less digits than its factorization.

642903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11301.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 642903 is about 801.8123221802. The cubic root of 642903 is about 86.3074895024.

The spelling of 642903 in words is "six hundred forty-two thousand, nine hundred three".