42237409 has 2 divisors, whose sum is σ = 42237410. Its totient is φ = 42237408.

The previous prime is 42237379. The next prime is 42237457. The reversal of 42237409 is 90473224.

42237409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41990400 + 247009 = 6480^2 + 497^2 .

It is a cyclic number.

It is not a de Polignac number, because 42237409 - 2¹³ = 42229217 is a prime.

It is not a weakly prime, because it can be changed into another prime (42237109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21118704 + 21118705.

It is an arithmetic number, because the mean of its divisors is an integer number (21118705).

Almost surely, 2^42237409 is an apocalyptic number.

It is an amenable number.

42237409 is a deficient number, since it is larger than the sum of its proper divisors (1).

42237409 is an equidigital number, since it uses as much as digits as its factorization.

42237409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 31.

The square root of 42237409 is about 6499.0313893687. The cubic root of 42237409 is about 348.2563866779.

The spelling of 42237409 in words is "forty-two million, two hundred thirty-seven thousand, four hundred nine".