1864426009 has 2 divisors, whose sum is σ = 1864426010. Its totient is φ = 1864426008.

The previous prime is 1864426007. The next prime is 1864426027. The reversal of 1864426009 is 9006244681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1670520384 + 193905625 = 40872^2 + 13925^2 .

It is a cyclic number.

It is not a de Polignac number, because 1864426009 - 2¹ = 1864426007 is a prime.

Together with 1864426007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1864426001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932213004 + 932213005.

It is an arithmetic number, because the mean of its divisors is an integer number (932213005).

Almost surely, 2^1864426009 is an apocalyptic number.

It is an amenable number.

1864426009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1864426009 is an equidigital number, since it uses as much as digits as its factorization.

1864426009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 1864426009 is about 43178.9996294495. Note that the first 3 decimals coincide. The cubic root of 1864426009 is about 1230.7836478452.

The spelling of 1864426009 in words is "one billion, eight hundred sixty-four million, four hundred twenty-six thousand, nine".