1890539939 has 2 divisors, whose sum is σ = 1890539940. Its totient is φ = 1890539938.

The previous prime is 1890539921. The next prime is 1890539969. The reversal of 1890539939 is 9399350981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1890539939 - 2²⁸ = 1622104483 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1890539969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945269969 + 945269970.

It is an arithmetic number, because the mean of its divisors is an integer number (945269970).

Almost surely, 2^1890539939 is an apocalyptic number.

1890539939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1890539939 is an equidigital number, since it uses as much as digits as its factorization.

1890539939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2361960, while the sum is 56.

The square root of 1890539939 is about 43480.3396835857. The cubic root of 1890539939 is about 1236.5033164396.

The spelling of 1890539939 in words is "one billion, eight hundred ninety million, five hundred thirty-nine thousand, nine hundred thirty-nine".