1890109 has 8 divisors (see below), whose sum is σ = 2046240. Its totient is φ = 1735536.

The previous prime is 1890107. The next prime is 1890113. The reversal of 1890109 is 9010981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1890109 - 2¹ = 1890107 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1890103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4302 + ... + 4720.

It is an arithmetic number, because the mean of its divisors is an integer number (255780).

2^1890109 is an apocalyptic number.

It is an amenable number.

1890109 is a deficient number, since it is larger than the sum of its proper divisors (156131).

1890109 is a wasteful number, since it uses less digits than its factorization.

1890109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 1890109 is about 1374.8123508319. The cubic root of 1890109 is about 123.6409357745.

It can be divided in two parts, 189010 and 9, that multiplied together give a triangular number (1701090 = T₁₈₄₄).

The spelling of 1890109 in words is "one million, eight hundred ninety thousand, one hundred nine".