71540437 has 4 divisors (see below), whose sum is σ = 75748716. Its totient is φ = 67332160.

The previous prime is 71540423. The next prime is 71540473. The reversal of 71540437 is 73404517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73404517 = 5503 ⋅13339.

It can be written as a sum of positive squares in 2 ways, for example, as 21399876 + 50140561 = 4626^2 + 7081^2 .

It is a cyclic number.

It is not a de Polignac number, because 71540437 - 2⁷ = 71540309 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 71540399 and 71540408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71540137) 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, 2104114 + ... + 2104147.

It is an arithmetic number, because the mean of its divisors is an integer number (18937179).

Almost surely, 2^71540437 is an apocalyptic number.

It is an amenable number.

71540437 is a deficient number, since it is larger than the sum of its proper divisors (4208279).

71540437 is a wasteful number, since it uses less digits than its factorization.

71540437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4208278.

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 71540437 is about 8458.1580146034. The cubic root of 71540437 is about 415.1297547523.

The spelling of 71540437 in words is "seventy-one million, five hundred forty thousand, four hundred thirty-seven".