72134401 has 4 divisors (see below), whose sum is σ = 72395092. Its totient is φ = 71873712.

The previous prime is 72134399. The next prime is 72134437. The reversal of 72134401 is 10443127.

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 43243776 + 28890625 = 6576^2 + 5375^2 .

It is a cyclic number.

It is not a de Polignac number, because 72134401 - 2¹ = 72134399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72134441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129930 + ... + 130483.

It is an arithmetic number, because the mean of its divisors is an integer number (18098773).

Almost surely, 2^72134401 is an apocalyptic number.

It is an amenable number.

72134401 is a deficient number, since it is larger than the sum of its proper divisors (260691).

72134401 is a wasteful number, since it uses less digits than its factorization.

72134401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260690.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 72134401 is about 8493.1973366925. The cubic root of 72134401 is about 416.2754605113.

Adding to 72134401 its reverse (10443127), we get a palindrome (82577528).

The spelling of 72134401 in words is "seventy-two million, one hundred thirty-four thousand, four hundred one".