40638571 has 2 divisors, whose sum is σ = 40638572. Its totient is φ = 40638570.

The previous prime is 40638523. The next prime is 40638581. The reversal of 40638571 is 17583604.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40638571 - 2²³ = 32249963 is a prime.

It is not a weakly prime, because it can be changed into another prime (40638581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20319285 + 20319286.

It is an arithmetic number, because the mean of its divisors is an integer number (20319286).

Almost surely, 2^40638571 is an apocalyptic number.

40638571 is a deficient number, since it is larger than the sum of its proper divisors (1).

40638571 is an equidigital number, since it uses as much as digits as its factorization.

40638571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 40638571 is about 6374.8388999252. The cubic root of 40638571 is about 343.8054916035.

It can be divided in two parts, 40638 and 571, that added together give a square (41209 = 203²).

The spelling of 40638571 in words is "forty million, six hundred thirty-eight thousand, five hundred seventy-one".