42000649 has 2 divisors, whose sum is σ = 42000650. Its totient is φ = 42000648.

The previous prime is 42000611. The next prime is 42000653. The reversal of 42000649 is 94600024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25452025 + 16548624 = 5045^2 + 4068^2 .

It is a cyclic number.

It is not a de Polignac number, because 42000649 - 2⁷ = 42000521 is a prime.

It is not a weakly prime, because it can be changed into another prime (42000349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21000324 + 21000325.

It is an arithmetic number, because the mean of its divisors is an integer number (21000325).

Almost surely, 2^42000649 is an apocalyptic number.

It is an amenable number.

42000649 is a deficient number, since it is larger than the sum of its proper divisors (1).

42000649 is an equidigital number, since it uses as much as digits as its factorization.

42000649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 42000649 is about 6480.7907696515. The cubic root of 42000649 is about 347.6044549090.

The spelling of 42000649 in words is "forty-two million, six hundred forty-nine", and thus it is an aban number.