38537881 has 2 divisors, whose sum is σ = 38537882. Its totient is φ = 38537880.

The previous prime is 38537819. The next prime is 38537887. The reversal of 38537881 is 18873583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32387481 + 6150400 = 5691^2 + 2480^2 .

It is a cyclic number.

It is not a de Polignac number, because 38537881 - 2¹⁵ = 38505113 is a prime.

It is a super-2 number, since 2×38537881² = 2970336543940322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (38537887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19268940 + 19268941.

It is an arithmetic number, because the mean of its divisors is an integer number (19268941).

Almost surely, 2^38537881 is an apocalyptic number.

It is an amenable number.

38537881 is a deficient number, since it is larger than the sum of its proper divisors (1).

38537881 is an equidigital number, since it uses as much as digits as its factorization.

38537881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 43.

The square root of 38537881 is about 6207.8886104697. Note that the first 3 decimals coincide. The cubic root of 38537881 is about 337.7763801024.

The spelling of 38537881 in words is "thirty-eight million, five hundred thirty-seven thousand, eight hundred eighty-one".