40138121 has 2 divisors, whose sum is σ = 40138122. Its totient is φ = 40138120.

The previous prime is 40138103. The next prime is 40138129. The reversal of 40138121 is 12183104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40005625 + 132496 = 6325^2 + 364^2 .

It is a cyclic number.

It is not a de Polignac number, because 40138121 - 2¹⁴ = 40121737 is a prime.

It is a super-2 number, since 2×40138121² = 3222137514821282, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 40138093 and 40138102.

It is not a weakly prime, because it can be changed into another prime (40138129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20069060 + 20069061.

It is an arithmetic number, because the mean of its divisors is an integer number (20069061).

Almost surely, 2^40138121 is an apocalyptic number.

It is an amenable number.

40138121 is a deficient number, since it is larger than the sum of its proper divisors (1).

40138121 is an equidigital number, since it uses as much as digits as its factorization.

40138121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 40138121 is about 6335.4653341329. The cubic root of 40138121 is about 342.3883764333.

The spelling of 40138121 in words is "forty million, one hundred thirty-eight thousand, one hundred twenty-one".