320429903 has 4 divisors (see below), whose sum is σ = 331479240. Its totient is φ = 309380568.

The previous prime is 320429899. The next prime is 320429939. The reversal of 320429903 is 309924023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 309924023 = 149 ⋅2080027.

It is a cyclic number.

It is not a de Polignac number, because 320429903 - 2² = 320429899 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 320429903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320429983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5524625 + ... + 5524682.

It is an arithmetic number, because the mean of its divisors is an integer number (82869810).

Almost surely, 2^320429903 is an apocalyptic number.

320429903 is a deficient number, since it is larger than the sum of its proper divisors (11049337).

320429903 is a wasteful number, since it uses less digits than its factorization.

320429903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11049336.

The product of its (nonzero) digits is 11664, while the sum is 32.

The square root of 320429903 is about 17900.5559410874. Note that the first 3 decimals coincide. The cubic root of 320429903 is about 684.2965431852.

The spelling of 320429903 in words is "three hundred twenty million, four hundred twenty-nine thousand, nine hundred three".