38645021 has 2 divisors, whose sum is σ = 38645022. Its totient is φ = 38645020.

The previous prime is 38645017. The next prime is 38645027. The reversal of 38645021 is 12054683.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36120100 + 2524921 = 6010^2 + 1589^2 .

It is a cyclic number.

It is not a de Polignac number, because 38645021 - 2² = 38645017 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38645027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19322510 + 19322511.

It is an arithmetic number, because the mean of its divisors is an integer number (19322511).

Almost surely, 2^38645021 is an apocalyptic number.

It is an amenable number.

38645021 is a deficient number, since it is larger than the sum of its proper divisors (1).

38645021 is an equidigital number, since it uses as much as digits as its factorization.

38645021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 38645021 is about 6216.5119641162. The cubic root of 38645021 is about 338.0891102887.

The spelling of 38645021 in words is "thirty-eight million, six hundred forty-five thousand, twenty-one".