42403957 has 2 divisors, whose sum is σ = 42403958. Its totient is φ = 42403956.

The previous prime is 42403951. The next prime is 42403979. The reversal of 42403957 is 75930424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32706961 + 9696996 = 5719^2 + 3114^2 .

It is a cyclic number.

It is not a de Polignac number, because 42403957 - 2²³ = 34015349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42403951) 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, 21201978 + 21201979.

It is an arithmetic number, because the mean of its divisors is an integer number (21201979).

Almost surely, 2^42403957 is an apocalyptic number.

It is an amenable number.

42403957 is a deficient number, since it is larger than the sum of its proper divisors (1).

42403957 is an equidigital number, since it uses as much as digits as its factorization.

42403957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 42403957 is about 6511.8320770732. The cubic root of 42403957 is about 348.7135275296.

The spelling of 42403957 in words is "forty-two million, four hundred three thousand, nine hundred fifty-seven".