40642837 has 2 divisors, whose sum is σ = 40642838. Its totient is φ = 40642836.

The previous prime is 40642813. The next prime is 40642841. The reversal of 40642837 is 73824604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27783441 + 12859396 = 5271^2 + 3586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40642837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40642807) 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, 20321418 + 20321419.

It is an arithmetic number, because the mean of its divisors is an integer number (20321419).

Almost surely, 2^40642837 is an apocalyptic number.

It is an amenable number.

40642837 is a deficient number, since it is larger than the sum of its proper divisors (1).

40642837 is an equidigital number, since it uses as much as digits as its factorization.

40642837 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 40642837 is about 6375.1734878354. The cubic root of 40642837 is about 343.8175214139.

The spelling of 40642837 in words is "forty million, six hundred forty-two thousand, eight hundred thirty-seven".