40309793 has 2 divisors, whose sum is σ = 40309794. Its totient is φ = 40309792.

The previous prime is 40309783. The next prime is 40309817. The reversal of 40309793 is 39790304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35188624 + 5121169 = 5932^2 + 2263^2 .

It is a cyclic number.

It is not a de Polignac number, because 40309793 - 2⁶ = 40309729 is a prime.

It is not a weakly prime, because it can be changed into another prime (40309783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20154896 + 20154897.

It is an arithmetic number, because the mean of its divisors is an integer number (20154897).

Almost surely, 2^40309793 is an apocalyptic number.

It is an amenable number.

40309793 is a deficient number, since it is larger than the sum of its proper divisors (1).

40309793 is an equidigital number, since it uses as much as digits as its factorization.

40309793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20412, while the sum is 35.

The square root of 40309793 is about 6348.9993699795. Note that the first 3 decimals coincide. The cubic root of 40309793 is about 342.8758174269.

The spelling of 40309793 in words is "forty million, three hundred nine thousand, seven hundred ninety-three".