40138169 has 2 divisors, whose sum is σ = 40138170. Its totient is φ = 40138168.

The previous prime is 40138129. The next prime is 40138177. The reversal of 40138169 is 96183104.

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., 22202944 + 17935225 = 4712^2 + 4235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40138169 is a prime.

It is a super-2 number, since 2×40138169² = 3222145221345122, which contains 22 as substring.

It is a Chen prime.

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, 20069084 + 20069085.

It is an arithmetic number, because the mean of its divisors is an integer number (20069085).

Almost surely, 2^40138169 is an apocalyptic number.

It is an amenable number.

40138169 is a deficient number, since it is larger than the sum of its proper divisors (1).

40138169 is an equidigital number, since it uses as much as digits as its factorization.

40138169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 40138169 is about 6335.4691223302. The cubic root of 40138169 is about 342.3885129173.

The spelling of 40138169 in words is "forty million, one hundred thirty-eight thousand, one hundred sixty-nine".