72238129 has 4 divisors (see below), whose sum is σ = 72953460. Its totient is φ = 71522800.

The previous prime is 72238121. The next prime is 72238139. The reversal of 72238129 is 92183227.

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

It can be written as a sum of positive squares in 2 ways, for example, as 47238129 + 25000000 = 6873^2 + 5000^2 .

It is a cyclic number.

It is not a de Polignac number, because 72238129 - 2³ = 72238121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72238094 and 72238103.

It is not an unprimeable number, because it can be changed into a prime (72238121) 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, 357514 + ... + 357715.

It is an arithmetic number, because the mean of its divisors is an integer number (18238365).

Almost surely, 2^72238129 is an apocalyptic number.

It is an amenable number.

72238129 is a deficient number, since it is larger than the sum of its proper divisors (715331).

72238129 is a wasteful number, since it uses less digits than its factorization.

72238129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715330.

The product of its digits is 12096, while the sum is 34.

The square root of 72238129 is about 8499.3016771968. The cubic root of 72238129 is about 416.4748972101.

The spelling of 72238129 in words is "seventy-two million, two hundred thirty-eight thousand, one hundred twenty-nine".