38693821 has 2 divisors, whose sum is σ = 38693822. Its totient is φ = 38693820.

The previous prime is 38693803. The next prime is 38693827. The reversal of 38693821 is 12839683.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26894596 + 11799225 = 5186^2 + 3435^2 .

It is a cyclic number.

It is not a de Polignac number, because 38693821 - 2⁵ = 38693789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38693827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19346910 + 19346911.

It is an arithmetic number, because the mean of its divisors is an integer number (19346911).

Almost surely, 2^38693821 is an apocalyptic number.

It is an amenable number.

38693821 is a deficient number, since it is larger than the sum of its proper divisors (1).

38693821 is an equidigital number, since it uses as much as digits as its factorization.

38693821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 38693821 is about 6220.4357564402. The cubic root of 38693821 is about 338.2313606855.

The spelling of 38693821 in words is "thirty-eight million, six hundred ninety-three thousand, eight hundred twenty-one".