1890648109 has 4 divisors (see below), whose sum is σ = 2160740704. Its totient is φ = 1620555516.

The previous prime is 1890648103. The next prime is 1890648113. The reversal of 1890648109 is 9018460981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9018460981 = 227 ⋅39728903.

It is a cyclic number.

It is not a de Polignac number, because 1890648109 - 2⁹ = 1890647597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1890648103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135046287 + ... + 135046300.

It is an arithmetic number, because the mean of its divisors is an integer number (540185176).

Almost surely, 2^1890648109 is an apocalyptic number.

It is an amenable number.

1890648109 is a deficient number, since it is larger than the sum of its proper divisors (270092595).

1890648109 is an equidigital number, since it uses as much as digits as its factorization.

1890648109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270092594.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 1890648109 is about 43481.5835613194. The cubic root of 1890648109 is about 1236.5268987700.

The spelling of 1890648109 in words is "one billion, eight hundred ninety million, six hundred forty-eight thousand, one hundred nine".