82726421 has 2 divisors, whose sum is σ = 82726422. Its totient is φ = 82726420.

The previous prime is 82726393. The next prime is 82726429. The reversal of 82726421 is 12462728.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82719025 + 7396 = 9095^2 + 86^2 .

It is a cyclic number.

It is not a de Polignac number, because 82726421 - 2²² = 78532117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82726429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41363210 + 41363211.

It is an arithmetic number, because the mean of its divisors is an integer number (41363211).

Almost surely, 2^82726421 is an apocalyptic number.

It is an amenable number.

82726421 is a deficient number, since it is larger than the sum of its proper divisors (1).

82726421 is an equidigital number, since it uses as much as digits as its factorization.

82726421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 32.

The square root of 82726421 is about 9095.4065879432. The cubic root of 82726421 is about 435.7272741703.

The spelling of 82726421 in words is "eighty-two million, seven hundred twenty-six thousand, four hundred twenty-one".