40037861 has 2 divisors, whose sum is σ = 40037862. Its totient is φ = 40037860.

The previous prime is 40037831. The next prime is 40037863. The reversal of 40037861 is 16873004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35224225 + 4813636 = 5935^2 + 2194^2 .

It is a cyclic number.

It is not a de Polignac number, because 40037861 - 2¹⁰ = 40036837 is a prime.

Together with 40037863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40037863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20018930 + 20018931.

It is an arithmetic number, because the mean of its divisors is an integer number (20018931).

Almost surely, 2^40037861 is an apocalyptic number.

It is an amenable number.

40037861 is a deficient number, since it is larger than the sum of its proper divisors (1).

40037861 is an equidigital number, since it uses as much as digits as its factorization.

40037861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 40037861 is about 6327.5477872553. The cubic root of 40037861 is about 342.1030576413.

The spelling of 40037861 in words is "forty million, thirty-seven thousand, eight hundred sixty-one".