72403 has 4 divisors (see below), whose sum is σ = 76680. Its totient is φ = 68128.

The previous prime is 72383. The next prime is 72421. The reversal of 72403 is 30427.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72403 is a prime.

It is a Duffinian number.

72403 is a lucky number.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (72493) 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, 2113 + ... + 2146.

It is an arithmetic number, because the mean of its divisors is an integer number (19170).

2⁷²⁴⁰³ is an apocalyptic number.

72403 is a deficient number, since it is larger than the sum of its proper divisors (4277).

72403 is a wasteful number, since it uses less digits than its factorization.

72403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4276.

The product of its (nonzero) digits is 168, while the sum is 16.

The square root of 72403 is about 269.0780555898. The cubic root of 72403 is about 41.6791500374.

The spelling of 72403 in words is "seventy-two thousand, four hundred three", and thus it is an iban number.