1918740 has 48 divisors (see below), whose sum is σ = 5439168. Its totient is φ = 505344.

The previous prime is 1918733. The next prime is 1918747. The reversal of 1918740 is 478191.

It is an interprime number because it is at equal distance from previous prime (1918733) and next prime (1918747).

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 Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1918698 and 1918707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1918747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6639 + ... + 6921.

It is an arithmetic number, because the mean of its divisors is an integer number (113316).

2^1918740 is an apocalyptic number.

1918740 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 1918740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2719584).

1918740 is an abundant number, since it is smaller than the sum of its proper divisors (3520428).

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

1918740 is a wasteful number, since it uses less digits than its factorization.

1918740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408 (or 406 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 1918740 is about 1385.1859081004. The cubic root of 1918740 is about 124.2621060041.

The spelling of 1918740 in words is "one million, nine hundred eighteen thousand, seven hundred forty".