71973823 has 2 divisors, whose sum is σ = 71973824. Its totient is φ = 71973822.

The previous prime is 71973809. The next prime is 71973829. The reversal of 71973823 is 32837917.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71973823 - 2¹⁷ = 71842751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71973829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35986911 + 35986912.

It is an arithmetic number, because the mean of its divisors is an integer number (35986912).

Almost surely, 2^71973823 is an apocalyptic number.

71973823 is a deficient number, since it is larger than the sum of its proper divisors (1).

71973823 is an equidigital number, since it uses as much as digits as its factorization.

71973823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63504, while the sum is 40.

The square root of 71973823 is about 8483.7387394945. The cubic root of 71973823 is about 415.9663415045.

The spelling of 71973823 in words is "seventy-one million, nine hundred seventy-three thousand, eight hundred twenty-three".