38656421 has 2 divisors, whose sum is σ = 38656422. Its totient is φ = 38656420.

The previous prime is 38656417. The next prime is 38656427. The reversal of 38656421 is 12465683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37576900 + 1079521 = 6130^2 + 1039^2 .

It is a cyclic number.

It is not a de Polignac number, because 38656421 - 2² = 38656417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38656427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19328210 + 19328211.

It is an arithmetic number, because the mean of its divisors is an integer number (19328211).

Almost surely, 2^38656421 is an apocalyptic number.

It is an amenable number.

38656421 is a deficient number, since it is larger than the sum of its proper divisors (1).

38656421 is an equidigital number, since it uses as much as digits as its factorization.

38656421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The square root of 38656421 is about 6217.4288094034. The cubic root of 38656421 is about 338.1223516295.

The spelling of 38656421 in words is "thirty-eight million, six hundred fifty-six thousand, four hundred twenty-one".