1911864 has 32 divisors (see below), whose sum is σ = 4911120. Its totient is φ = 619776.

The previous prime is 1911857. The next prime is 1911881. The reversal of 1911864 is 4681191.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189 + ... + 1964.

2^1911864 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 1911864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2455560).

1911864 is an abundant number, since it is smaller than the sum of its proper divisors (2999256).

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

1911864 is a wasteful number, since it uses less digits than its factorization.

1911864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2199 (or 2195 counting only the distinct ones).

The product of its digits is 1728, while the sum is 30.

The square root of 1911864 is about 1382.7017031884. The cubic root of 1911864 is about 124.1134930396.

It can be divided in two parts, 1911 and 864, that added together give a triangular number (2775 = T₇₄).

The spelling of 1911864 in words is "one million, nine hundred eleven thousand, eight hundred sixty-four".