40128937 has 2 divisors, whose sum is σ = 40128938. Its totient is φ = 40128936.

The previous prime is 40128917. The next prime is 40128961. The reversal of 40128937 is 73982104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26409321 + 13719616 = 5139^2 + 3704^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40128937 is a prime.

It is a super-2 number, since 2×40128937² = 3220663169499938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40128917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20064468 + 20064469.

It is an arithmetic number, because the mean of its divisors is an integer number (20064469).

Almost surely, 2^40128937 is an apocalyptic number.

It is an amenable number.

40128937 is a deficient number, since it is larger than the sum of its proper divisors (1).

40128937 is an equidigital number, since it uses as much as digits as its factorization.

40128937 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 40128937 is about 6334.7404840293. The cubic root of 40128937 is about 342.3622604897.

The spelling of 40128937 in words is "forty million, one hundred twenty-eight thousand, nine hundred thirty-seven".