40403257 has 2 divisors, whose sum is σ = 40403258. Its totient is φ = 40403256.

The previous prime is 40403243. The next prime is 40403281. The reversal of 40403257 is 75230404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21706281 + 18696976 = 4659^2 + 4324^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40403257 is a prime.

It is not a weakly prime, because it can be changed into another prime (40403057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20201628 + 20201629.

It is an arithmetic number, because the mean of its divisors is an integer number (20201629).

Almost surely, 2^40403257 is an apocalyptic number.

It is an amenable number.

40403257 is a deficient number, since it is larger than the sum of its proper divisors (1).

40403257 is an equidigital number, since it uses as much as digits as its factorization.

40403257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 40403257 is about 6356.3556382569. The cubic root of 40403257 is about 343.1406150250.

The spelling of 40403257 in words is "forty million, four hundred three thousand, two hundred fifty-seven".