42405949 has 2 divisors, whose sum is σ = 42405950. Its totient is φ = 42405948.

The previous prime is 42405941. The next prime is 42405953. The reversal of 42405949 is 94950424.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31843449 + 10562500 = 5643^2 + 3250^2 .

It is a cyclic number.

It is not a de Polignac number, because 42405949 - 2³ = 42405941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42405941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21202974 + 21202975.

It is an arithmetic number, because the mean of its divisors is an integer number (21202975).

Almost surely, 2^42405949 is an apocalyptic number.

It is an amenable number.

42405949 is a deficient number, since it is larger than the sum of its proper divisors (1).

42405949 is an equidigital number, since it uses as much as digits as its factorization.

42405949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 42405949 is about 6511.9850276241. The cubic root of 42405949 is about 348.7189879200.

The spelling of 42405949 in words is "forty-two million, four hundred five thousand, nine hundred forty-nine".