63786421 has 2 divisors, whose sum is σ = 63786422. Its totient is φ = 63786420.

The previous prime is 63786403. The next prime is 63786427. The reversal of 63786421 is 12468736.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45037521 + 18748900 = 6711^2 + 4330^2 .

It is a cyclic number.

It is not a de Polignac number, because 63786421 - 2⁷ = 63786293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63786427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31893210 + 31893211.

It is an arithmetic number, because the mean of its divisors is an integer number (31893211).

Almost surely, 2^63786421 is an apocalyptic number.

It is an amenable number.

63786421 is a deficient number, since it is larger than the sum of its proper divisors (1).

63786421 is an equidigital number, since it uses as much as digits as its factorization.

63786421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 37.

The square root of 63786421 is about 7986.6401571625. The cubic root of 63786421 is about 399.5545478651.

It can be divided in two parts, 637864 and 21, that added together give a triangular number (637885 = T₁₁₂₉).

The spelling of 63786421 in words is "sixty-three million, seven hundred eighty-six thousand, four hundred twenty-one".