71398837 has 2 divisors, whose sum is σ = 71398838. Its totient is φ = 71398836.

The previous prime is 71398829. The next prime is 71398843. The reversal of 71398837 is 73889317.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61324561 + 10074276 = 7831^2 + 3174^2 .

It is a cyclic number.

It is not a de Polignac number, because 71398837 - 2³ = 71398829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71398867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35699418 + 35699419.

It is an arithmetic number, because the mean of its divisors is an integer number (35699419).

Almost surely, 2^71398837 is an apocalyptic number.

It is an amenable number.

71398837 is a deficient number, since it is larger than the sum of its proper divisors (1).

71398837 is an equidigital number, since it uses as much as digits as its factorization.

71398837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 46.

The square root of 71398837 is about 8449.7832516580. The cubic root of 71398837 is about 414.8556850508.

It can be divided in two parts, 713988 and 37, that added together give a square (714025 = 845²).

The spelling of 71398837 in words is "seventy-one million, three hundred ninety-eight thousand, eight hundred thirty-seven".