1890864427 has 2 divisors, whose sum is σ = 1890864428. Its totient is φ = 1890864426.

The previous prime is 1890864377. The next prime is 1890864449. The reversal of 1890864427 is 7244680981.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1890864427 - 2⁷ = 1890864299 is a prime.

It is not a weakly prime, because it can be changed into another prime (1890864487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945432213 + 945432214.

It is an arithmetic number, because the mean of its divisors is an integer number (945432214).

Almost surely, 2^1890864427 is an apocalyptic number.

1890864427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1890864427 is an equidigital number, since it uses as much as digits as its factorization.

1890864427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 774144, while the sum is 49.

The square root of 1890864427 is about 43484.0709570758. The cubic root of 1890864427 is about 1236.5740559369.

The spelling of 1890864427 in words is "one billion, eight hundred ninety million, eight hundred sixty-four thousand, four hundred twenty-seven".