38899181 has 2 divisors, whose sum is σ = 38899182. Its totient is φ = 38899180.

The previous prime is 38899169. The next prime is 38899183. The reversal of 38899181 is 18199883.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32604100 + 6295081 = 5710^2 + 2509^2 .

It is a cyclic number.

It is not a de Polignac number, because 38899181 - 2¹⁸ = 38637037 is a prime.

It is a super-2 number, since 2×38899181² = 3026292564941522, which contains 22 as substring.

Together with 38899183, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38899183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19449590 + 19449591.

It is an arithmetic number, because the mean of its divisors is an integer number (19449591).

Almost surely, 2^38899181 is an apocalyptic number.

It is an amenable number.

38899181 is a deficient number, since it is larger than the sum of its proper divisors (1).

38899181 is an equidigital number, since it uses as much as digits as its factorization.

38899181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 47.

The square root of 38899181 is about 6236.9207947512. The cubic root of 38899181 is about 338.8286711522.

The spelling of 38899181 in words is "thirty-eight million, eight hundred ninety-nine thousand, one hundred eighty-one".