42640417 has 2 divisors, whose sum is σ = 42640418. Its totient is φ = 42640416.

The previous prime is 42640393. The next prime is 42640441. The reversal of 42640417 is 71404624.

It is a balanced prime because it is at equal distance from previous prime (42640393) and next prime (42640441).

It can be written as a sum of positive squares in only one way, i.e., 42562576 + 77841 = 6524^2 + 279^2 .

It is a cyclic number.

It is not a de Polignac number, because 42640417 - 2⁷ = 42640289 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42640217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21320208 + 21320209.

It is an arithmetic number, because the mean of its divisors is an integer number (21320209).

Almost surely, 2^42640417 is an apocalyptic number.

It is an amenable number.

42640417 is a deficient number, since it is larger than the sum of its proper divisors (1).

42640417 is an equidigital number, since it uses as much as digits as its factorization.

42640417 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 42640417 is about 6529.9630167406. The cubic root of 42640417 is about 349.3605112063.

The spelling of 42640417 in words is "forty-two million, six hundred forty thousand, four hundred seventeen".