40939309 has 2 divisors, whose sum is σ = 40939310. Its totient is φ = 40939308.

The previous prime is 40939291. The next prime is 40939321. The reversal of 40939309 is 90393904.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35164900 + 5774409 = 5930^2 + 2403^2 .

It is a cyclic number.

It is not a de Polignac number, because 40939309 - 2⁷ = 40939181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40939399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20469654 + 20469655.

It is an arithmetic number, because the mean of its divisors is an integer number (20469655).

Almost surely, 2^40939309 is an apocalyptic number.

It is an amenable number.

40939309 is a deficient number, since it is larger than the sum of its proper divisors (1).

40939309 is an equidigital number, since it uses as much as digits as its factorization.

40939309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 40939309 is about 6398.3833114311. The cubic root of 40939309 is about 344.6514971285.

The spelling of 40939309 in words is "forty million, nine hundred thirty-nine thousand, three hundred nine".