40837729 has 2 divisors, whose sum is σ = 40837730. Its totient is φ = 40837728.

The previous prime is 40837717. The next prime is 40837777. The reversal of 40837729 is 92773804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40449600 + 388129 = 6360^2 + 623^2 .

It is a cyclic number.

It is not a de Polignac number, because 40837729 - 2⁹ = 40837217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40837691 and 40837700.

It is not a weakly prime, because it can be changed into another prime (40837789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20418864 + 20418865.

It is an arithmetic number, because the mean of its divisors is an integer number (20418865).

Almost surely, 2^40837729 is an apocalyptic number.

It is an amenable number.

40837729 is a deficient number, since it is larger than the sum of its proper divisors (1).

40837729 is an equidigital number, since it uses as much as digits as its factorization.

40837729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 40837729 is about 6390.4404386552. The cubic root of 40837729 is about 344.3662073857.

The spelling of 40837729 in words is "forty million, eight hundred thirty-seven thousand, seven hundred twenty-nine".