72147401 has 4 divisors (see below), whose sum is σ = 72564612. Its totient is φ = 71730192.

The previous prime is 72147391. The next prime is 72147403. The reversal of 72147401 is 10474127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10474127 = 61 ⋅171707.

It can be written as a sum of positive squares in 2 ways, for example, as 48372025 + 23775376 = 6955^2 + 4876^2 .

It is a cyclic number.

It is not a de Polignac number, because 72147401 - 2¹⁸ = 71885257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72147403) 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, 208346 + ... + 208691.

It is an arithmetic number, because the mean of its divisors is an integer number (18141153).

Almost surely, 2^72147401 is an apocalyptic number.

It is an amenable number.

72147401 is a deficient number, since it is larger than the sum of its proper divisors (417211).

72147401 is a wasteful number, since it uses less digits than its factorization.

72147401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417210.

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 72147401 is about 8493.9626205912. The cubic root of 72147401 is about 416.3004659449.

The spelling of 72147401 in words is "seventy-two million, one hundred forty-seven thousand, four hundred one".