40106309 has 2 divisors, whose sum is σ = 40106310. Its totient is φ = 40106308.

The previous prime is 40106303. The next prime is 40106317. The reversal of 40106309 is 90360104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24226084 + 15880225 = 4922^2 + 3985^2 .

It is a cyclic number.

It is not a de Polignac number, because 40106309 - 2⁴ = 40106293 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40106303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20053154 + 20053155.

It is an arithmetic number, because the mean of its divisors is an integer number (20053155).

Almost surely, 2^40106309 is an apocalyptic number.

It is an amenable number.

40106309 is a deficient number, since it is larger than the sum of its proper divisors (1).

40106309 is an equidigital number, since it uses as much as digits as its factorization.

40106309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 40106309 is about 6332.9542079507. The cubic root of 40106309 is about 342.2978977098.

The spelling of 40106309 in words is "forty million, one hundred six thousand, three hundred nine".