40457689 has 2 divisors, whose sum is σ = 40457690. Its totient is φ = 40457688.

The previous prime is 40457653. The next prime is 40457699. The reversal of 40457689 is 98675404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37454400 + 3003289 = 6120^2 + 1733^2 .

It is a cyclic number.

It is not a de Polignac number, because 40457689 - 2¹¹ = 40455641 is a prime.

It is not a weakly prime, because it can be changed into another prime (40457629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20228844 + 20228845.

It is an arithmetic number, because the mean of its divisors is an integer number (20228845).

Almost surely, 2^40457689 is an apocalyptic number.

It is an amenable number.

40457689 is a deficient number, since it is larger than the sum of its proper divisors (1).

40457689 is an equidigital number, since it uses as much as digits as its factorization.

40457689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 40457689 is about 6360.6358958834. The cubic root of 40457689 is about 343.2946409618.

The spelling of 40457689 in words is "forty million, four hundred fifty-seven thousand, six hundred eighty-nine".