65403 has 18 divisors (see below), whose sum is σ = 104676. Its totient is φ = 39312.

The previous prime is 65393. The next prime is 65407. The reversal of 65403 is 30456.

It is a happy number.

It is not a de Polignac number, because 65403 - 2⁵ = 65371 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 65403.

It is not an unprimeable number, because it can be changed into a prime (65407) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1500 + ... + 1542.

2⁶⁵⁴⁰³ is an apocalyptic number.

65403 is a deficient number, since it is larger than the sum of its proper divisors (39273).

65403 is a wasteful number, since it uses less digits than its factorization.

65403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75 (or 59 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 65403 is about 255.7401024478. The cubic root of 65403 is about 40.2901814443.

Adding to 65403 its reverse (30456), we get a palindrome (95859).

The spelling of 65403 in words is "sixty-five thousand, four hundred three".