40720969 has 2 divisors, whose sum is σ = 40720970. Its totient is φ = 40720968.

The previous prime is 40720963. The next prime is 40720973. The reversal of 40720969 is 96902704.

40720969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32626944 + 8094025 = 5712^2 + 2845^2 .

It is a cyclic number.

It is not a de Polignac number, because 40720969 - 2³ = 40720961 is a prime.

It is a super-2 number, since 2×40720969² = 3316394632597922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40720961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20360484 + 20360485.

It is an arithmetic number, because the mean of its divisors is an integer number (20360485).

Almost surely, 2^40720969 is an apocalyptic number.

It is an amenable number.

40720969 is a deficient number, since it is larger than the sum of its proper divisors (1).

40720969 is an equidigital number, since it uses as much as digits as its factorization.

40720969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 40720969 is about 6381.2983788568. The cubic root of 40720969 is about 344.0376992441.

The spelling of 40720969 in words is "forty million, seven hundred twenty thousand, nine hundred sixty-nine".