303640 has 16 divisors (see below), whose sum is σ = 683280. Its totient is φ = 121440.

The previous prime is 303619. The next prime is 303643. The reversal of 303640 is 46303.

It is a happy number.

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 303640.

It is not an unprimeable number, because it can be changed into a prime (303643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3756 + ... + 3835.

It is an arithmetic number, because the mean of its divisors is an integer number (42705).

2³⁰³⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

303640 is an abundant number, since it is smaller than the sum of its proper divisors (379640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

303640 is a wasteful number, since it uses less digits than its factorization.

303640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7602 (or 7598 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 303640 is about 551.0353890632. The cubic root of 303640 is about 67.2129557409.

Adding to 303640 its reverse (46303), we get a palindrome (349943).

The spelling of 303640 in words is "three hundred three thousand, six hundred forty".