40657973 has 2 divisors, whose sum is σ = 40657974. Its totient is φ = 40657972.

The previous prime is 40657933. The next prime is 40658003. The reversal of 40657973 is 37975604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37478884 + 3179089 = 6122^2 + 1783^2 .

It is a cyclic number.

It is not a de Polignac number, because 40657973 - 2⁶ = 40657909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40657973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40657933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20328986 + 20328987.

It is an arithmetic number, because the mean of its divisors is an integer number (20328987).

Almost surely, 2^40657973 is an apocalyptic number.

It is an amenable number.

40657973 is a deficient number, since it is larger than the sum of its proper divisors (1).

40657973 is an equidigital number, since it uses as much as digits as its factorization.

40657973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 41.

The square root of 40657973 is about 6376.3604822814. The cubic root of 40657973 is about 343.8601970447.

The spelling of 40657973 in words is "forty million, six hundred fifty-seven thousand, nine hundred seventy-three".