38477821 has 2 divisors, whose sum is σ = 38477822. Its totient is φ = 38477820.

The previous prime is 38477801. The next prime is 38477833. The reversal of 38477821 is 12877483.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38007225 + 470596 = 6165^2 + 686^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38477821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38477801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19238910 + 19238911.

It is an arithmetic number, because the mean of its divisors is an integer number (19238911).

Almost surely, 2^38477821 is an apocalyptic number.

It is an amenable number.

38477821 is a deficient number, since it is larger than the sum of its proper divisors (1).

38477821 is an equidigital number, since it uses as much as digits as its factorization.

38477821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75264, while the sum is 40.

The square root of 38477821 is about 6203.0493307727. The cubic root of 38477821 is about 337.6008178003.

The spelling of 38477821 in words is "thirty-eight million, four hundred seventy-seven thousand, eight hundred twenty-one".