38493821 has 2 divisors, whose sum is σ = 38493822. Its totient is φ = 38493820.

The previous prime is 38493803. The next prime is 38493839. The reversal of 38493821 is 12839483.

It is a balanced prime because it is at equal distance from previous prime (38493803) and next prime (38493839).

It can be written as a sum of positive squares in only one way, i.e., 36168196 + 2325625 = 6014^2 + 1525^2 .

It is an emirp because it is prime and its reverse (12839483) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38493821 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 (38493841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19246910 + 19246911.

It is an arithmetic number, because the mean of its divisors is an integer number (19246911).

Almost surely, 2^38493821 is an apocalyptic number.

It is an amenable number.

38493821 is a deficient number, since it is larger than the sum of its proper divisors (1).

38493821 is an equidigital number, since it uses as much as digits as its factorization.

38493821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 38.

The square root of 38493821 is about 6204.3388850062. The cubic root of 38493821 is about 337.6476054857.

The spelling of 38493821 in words is "thirty-eight million, four hundred ninety-three thousand, eight hundred twenty-one".