38981893 has 2 divisors, whose sum is σ = 38981894. Its totient is φ = 38981892.

The previous prime is 38981837. The next prime is 38981903. The reversal of 38981893 is 39818983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36216324 + 2765569 = 6018^2 + 1663^2 .

It is an emirp because it is prime and its reverse (39818983) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38981893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38981993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19490946 + 19490947.

It is an arithmetic number, because the mean of its divisors is an integer number (19490947).

Almost surely, 2^38981893 is an apocalyptic number.

It is an amenable number.

38981893 is a deficient number, since it is larger than the sum of its proper divisors (1).

38981893 is an equidigital number, since it uses as much as digits as its factorization.

38981893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 49.

The square root of 38981893 is about 6243.5481098491. The cubic root of 38981893 is about 339.0686535569.

The spelling of 38981893 in words is "thirty-eight million, nine hundred eighty-one thousand, eight hundred ninety-three".