1918840 has 96 divisors (see below), whose sum is σ = 5540400. Its totient is φ = 591360.

The previous prime is 1918837. The next prime is 1918849. The reversal of 1918840 is 488191.

1918840 = T₂₅₅ + T₂₅₆ + ... + T₃₀₃.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918849) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21516 + ... + 21604.

2^1918840 is an apocalyptic number.

1918840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1918840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2770200).

1918840 is an abundant number, since it is smaller than the sum of its proper divisors (3621560).

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

1918840 is a wasteful number, since it uses less digits than its factorization.

1918840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 1918840 is about 1385.2220038680. Note that the first 3 decimals coincide. The cubic root of 1918840 is about 124.2642647115.

The spelling of 1918840 in words is "one million, nine hundred eighteen thousand, eight hundred forty".