72105403 has 4 divisors (see below), whose sum is σ = 72151560. Its totient is φ = 72059248.

The previous prime is 72105401. The next prime is 72105419. The reversal of 72105403 is 30450127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30450127 = 83 ⋅366869.

It is a cyclic number.

It is not a de Polignac number, because 72105403 - 2¹ = 72105401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72105401) 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, 20650 + ... + 23887.

It is an arithmetic number, because the mean of its divisors is an integer number (18037890).

Almost surely, 2^72105403 is an apocalyptic number.

72105403 is a deficient number, since it is larger than the sum of its proper divisors (46157).

72105403 is a wasteful number, since it uses less digits than its factorization.

72105403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46156.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 72105403 is about 8491.4900341460. The cubic root of 72105403 is about 416.2196721795.

The spelling of 72105403 in words is "seventy-two million, one hundred five thousand, four hundred three".