38821969 has 2 divisors, whose sum is σ = 38821970. Its totient is φ = 38821968.

The previous prime is 38821963. The next prime is 38821973. The reversal of 38821969 is 96912883.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37638225 + 1183744 = 6135^2 + 1088^2 .

It is a cyclic number.

It is not a de Polignac number, because 38821969 - 2³ = 38821961 is a prime.

It is a super-2 number, since 2×38821969² = 3014290554073922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (38821961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19410984 + 19410985.

It is an arithmetic number, because the mean of its divisors is an integer number (19410985).

Almost surely, 2^38821969 is an apocalyptic number.

It is an amenable number.

38821969 is a deficient number, since it is larger than the sum of its proper divisors (1).

38821969 is an equidigital number, since it uses as much as digits as its factorization.

38821969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 46.

The square root of 38821969 is about 6230.7278066049. The cubic root of 38821969 is about 338.6043393673.

The spelling of 38821969 in words is "thirty-eight million, eight hundred twenty-one thousand, nine hundred sixty-nine".