71390437 has 4 divisors (see below), whose sum is σ = 71450316. Its totient is φ = 71330560.

The previous prime is 71390401. The next prime is 71390441. The reversal of 71390437 is 73409317.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73409317 = 1493 ⋅49169.

It can be written as a sum of positive squares in 2 ways, for example, as 13645636 + 57744801 = 3694^2 + 7599^2 .

It is a cyclic number.

It is not a de Polignac number, because 71390437 - 2¹⁵ = 71357669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71390237) 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, 28114 + ... + 30547.

It is an arithmetic number, because the mean of its divisors is an integer number (17862579).

Almost surely, 2^71390437 is an apocalyptic number.

It is an amenable number.

71390437 is a deficient number, since it is larger than the sum of its proper divisors (59879).

71390437 is a wasteful number, since it uses less digits than its factorization.

71390437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59878.

The product of its (nonzero) digits is 15876, while the sum is 34.

The square root of 71390437 is about 8449.2861828678. The cubic root of 71390437 is about 414.8394152974.

The spelling of 71390437 in words is "seventy-one million, three hundred ninety thousand, four hundred thirty-seven".