1899664 has 20 divisors (see below), whose sum is σ = 3964156. Its totient is φ = 876672.

The previous prime is 1899661. The next prime is 1899673. The reversal of 1899664 is 4669981.

1899664 = T₂₅₇ + T₂₅₈ + ... + T₃₀₄.

It can be written as a sum of positive squares in 2 ways, for example, as 883600 + 1016064 = 940^2 + 1008^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1899664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1899661) 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, 4359 + ... + 4774.

2^1899664 is an apocalyptic number.

It is an amenable number.

1899664 is an abundant number, since it is smaller than the sum of its proper divisors (2064492).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1899664 is a wasteful number, since it uses less digits than its factorization.

1899664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9154 (or 9148 counting only the distinct ones).

The product of its digits is 93312, while the sum is 43.

The square root of 1899664 is about 1378.2829898101. The cubic root of 1899664 is about 123.8489315336.

The spelling of 1899664 in words is "one million, eight hundred ninety-nine thousand, six hundred sixty-four".