6421903 has 8 divisors (see below), whose sum is σ = 6861888. Its totient is φ = 5988864.

The previous prime is 6421901. The next prime is 6421907. The reversal of 6421903 is 3091246.

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 6421903 - 2¹ = 6421901 is a prime.

It is a super-5 number, since 5×6421903⁵ (a number of 35 digits) contains 55555 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421901) 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, 250 + ... + 3592.

It is an arithmetic number, because the mean of its divisors is an integer number (857736).

Almost surely, 2^6421903 is an apocalyptic number.

6421903 is a deficient number, since it is larger than the sum of its proper divisors (439985).

6421903 is a wasteful number, since it uses less digits than its factorization.

6421903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3473.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 6421903 is about 2534.1473911357. The cubic root of 6421903 is about 185.8751136841.

The spelling of 6421903 in words is "six million, four hundred twenty-one thousand, nine hundred three".