72155123 has 8 divisors (see below), whose sum is σ = 76567680. Its totient is φ = 67761280.

The previous prime is 72155113. The next prime is 72155183. The reversal of 72155123 is 32155127.

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

It is a cyclic number.

It is not a de Polignac number, because 72155123 - 2²⁶ = 5046259 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72155092 and 72155101.

It is not an unprimeable number, because it can be changed into a prime (72155113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3713 + ... + 12573.

It is an arithmetic number, because the mean of its divisors is an integer number (9570960).

Almost surely, 2^72155123 is an apocalyptic number.

72155123 is a deficient number, since it is larger than the sum of its proper divisors (4412557).

72155123 is a wasteful number, since it uses less digits than its factorization.

72155123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9357.

The product of its digits is 2100, while the sum is 26.

The square root of 72155123 is about 8494.4171665865. The cubic root of 72155123 is about 416.3153177505.

The spelling of 72155123 in words is "seventy-two million, one hundred fifty-five thousand, one hundred twenty-three".