72123405 has 8 divisors (see below), whose sum is σ = 115397472. Its totient is φ = 38465808.

The previous prime is 72123383. The next prime is 72123413. The reversal of 72123405 is 50432127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72123405 - 2⁷ = 72123277 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2404099 + ... + 2404128.

It is an arithmetic number, because the mean of its divisors is an integer number (14424684).

Almost surely, 2^72123405 is an apocalyptic number.

It is an amenable number.

72123405 is a deficient number, since it is larger than the sum of its proper divisors (43274067).

72123405 is a wasteful number, since it uses less digits than its factorization.

72123405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4808235.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 72123405 is about 8492.5499704152. The cubic root of 72123405 is about 416.2543074160.

The spelling of 72123405 in words is "seventy-two million, one hundred twenty-three thousand, four hundred five".