40257257 has 4 divisors (see below), whose sum is σ = 42376080. Its totient is φ = 38138436.

The previous prime is 40257247. The next prime is 40257271. The reversal of 40257257 is 75275204.

40257257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40257257 - 2⁶ = 40257193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40257227) 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 in 3 ways as a sum of consecutive naturals, for example, 1059383 + ... + 1059420.

It is an arithmetic number, because the mean of its divisors is an integer number (10594020).

Almost surely, 2^40257257 is an apocalyptic number.

It is an amenable number.

40257257 is a deficient number, since it is larger than the sum of its proper divisors (2118823).

40257257 is a wasteful number, since it uses less digits than its factorization.

40257257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2118822.

The product of its (nonzero) digits is 19600, while the sum is 32.

The square root of 40257257 is about 6344.8606761693. The cubic root of 40257257 is about 342.7267952837.

The spelling of 40257257 in words is "forty million, two hundred fifty-seven thousand, two hundred fifty-seven".