38139121 has 2 divisors, whose sum is σ = 38139122. Its totient is φ = 38139120.

The previous prime is 38139107. The next prime is 38139131. The reversal of 38139121 is 12193183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36784225 + 1354896 = 6065^2 + 1164^2 .

It is a cyclic number.

It is not a de Polignac number, because 38139121 - 2²⁵ = 4584689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 38139121.

It is not a weakly prime, because it can be changed into another prime (38139131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19069560 + 19069561.

It is an arithmetic number, because the mean of its divisors is an integer number (19069561).

Almost surely, 2^38139121 is an apocalyptic number.

It is an amenable number.

38139121 is a deficient number, since it is larger than the sum of its proper divisors (1).

38139121 is an equidigital number, since it uses as much as digits as its factorization.

38139121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 28.

The square root of 38139121 is about 6175.6878969067. The cubic root of 38139121 is about 336.6073229171.

The spelling of 38139121 in words is "thirty-eight million, one hundred thirty-nine thousand, one hundred twenty-one".