1918140 has 48 divisors (see below), whose sum is σ = 6139392. Its totient is φ = 438336.

The previous prime is 1918129. The next prime is 1918151. The reversal of 1918140 is 418191.

It is an interprime number because it is at equal distance from previous prime (1918129) and next prime (1918151).

It is a super-2 number, since 2×1918140² = 7358522119200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1918140.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1864 + ... + 2703.

It is an arithmetic number, because the mean of its divisors is an integer number (127904).

2^1918140 is an apocalyptic number.

1918140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1918140 is an abundant number, since it is smaller than the sum of its proper divisors (4221252).

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

1918140 is a wasteful number, since it uses less digits than its factorization.

1918140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4586 (or 4584 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 1918140 is about 1384.9693137395. The cubic root of 1918140 is about 124.2491521844.

The spelling of 1918140 in words is "one million, nine hundred eighteen thousand, one hundred forty".