1864393841 has 2 divisors, whose sum is σ = 1864393842. Its totient is φ = 1864393840.

The previous prime is 1864393807. The next prime is 1864393877. The reversal of 1864393841 is 1483934681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1827135025 + 37258816 = 42745^2 + 6104^2 .

It is an emirp because it is prime and its reverse (1483934681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1864393841 - 2³⁰ = 790652017 is a prime.

It is not a weakly prime, because it can be changed into another prime (1864398841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932196920 + 932196921.

It is an arithmetic number, because the mean of its divisors is an integer number (932196921).

Almost surely, 2^1864393841 is an apocalyptic number.

It is an amenable number.

1864393841 is a deficient number, since it is larger than the sum of its proper divisors (1).

1864393841 is an equidigital number, since it uses as much as digits as its factorization.

1864393841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 47.

The square root of 1864393841 is about 43178.6271319504. The cubic root of 1864393841 is about 1230.7765693349.

The spelling of 1864393841 in words is "one billion, eight hundred sixty-four million, three hundred ninety-three thousand, eight hundred forty-one".