38997793 has 2 divisors, whose sum is σ = 38997794. Its totient is φ = 38997792.

The previous prime is 38997781. The next prime is 38997853. The reversal of 38997793 is 39779983.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19918369 + 19079424 = 4463^2 + 4368^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38997793 is a prime.

It is not a weakly prime, because it can be changed into another prime (38997703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19498896 + 19498897.

It is an arithmetic number, because the mean of its divisors is an integer number (19498897).

Almost surely, 2^38997793 is an apocalyptic number.

It is an amenable number.

38997793 is a deficient number, since it is larger than the sum of its proper divisors (1).

38997793 is an equidigital number, since it uses as much as digits as its factorization.

38997793 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2571912, while the sum is 55.

The square root of 38997793 is about 6244.8212944807. The cubic root of 38997793 is about 339.1147472545.

The spelling of 38997793 in words is "thirty-eight million, nine hundred ninety-seven thousand, seven hundred ninety-three".