40138837 has 2 divisors, whose sum is σ = 40138838. Its totient is φ = 40138836.

The previous prime is 40138817. The next prime is 40138867. The reversal of 40138837 is 73883104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35533521 + 4605316 = 5961^2 + 2146^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40138837 is a prime.

It is a super-2 number, since 2×40138837² = 3222252471425138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40138817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20069418 + 20069419.

It is an arithmetic number, because the mean of its divisors is an integer number (20069419).

Almost surely, 2^40138837 is an apocalyptic number.

It is an amenable number.

40138837 is a deficient number, since it is larger than the sum of its proper divisors (1).

40138837 is an equidigital number, since it uses as much as digits as its factorization.

40138837 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 40138837 is about 6335.5218411746. The cubic root of 40138837 is about 342.3904123085.

The spelling of 40138837 in words is "forty million, one hundred thirty-eight thousand, eight hundred thirty-seven".