1890742187 has 2 divisors, whose sum is σ = 1890742188. Its totient is φ = 1890742186.

The previous prime is 1890742171. The next prime is 1890742199. The reversal of 1890742187 is 7812470981.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1890742187 - 2⁴ = 1890742171 is a prime.

It is not a weakly prime, because it can be changed into another prime (1890742127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945371093 + 945371094.

It is an arithmetic number, because the mean of its divisors is an integer number (945371094).

Almost surely, 2^1890742187 is an apocalyptic number.

1890742187 is a deficient number, since it is larger than the sum of its proper divisors (1).

1890742187 is an equidigital number, since it uses as much as digits as its factorization.

1890742187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 225792, while the sum is 47.

The square root of 1890742187 is about 43482.6653621877. The cubic root of 1890742187 is about 1236.5474081477.

The spelling of 1890742187 in words is "one billion, eight hundred ninety million, seven hundred forty-two thousand, one hundred eighty-seven".