1890864 has 50 divisors (see below), whose sum is σ = 5476460. Its totient is φ = 629856.

The previous prime is 1890851. The next prime is 1890869. The reversal of 1890864 is 4680981.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1890869) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 567 + ... + 2025.

2^1890864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1890864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2738230).

1890864 is an abundant number, since it is smaller than the sum of its proper divisors (3585596).

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

1890864 is a wasteful number, since it uses less digits than its factorization.

1890864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1479 (or 1464 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1890864 is about 1375.0869063445. The cubic root of 1890864 is about 123.6573962855.

The spelling of 1890864 in words is "one million, eight hundred ninety thousand, eight hundred sixty-four".