1916840 has 32 divisors (see below), whose sum is σ = 4353480. Its totient is φ = 759552.

The previous prime is 1916839. The next prime is 1916857. The reversal of 1916840 is 486191.

It can be written as a sum of positive squares in 4 ways, for example, as 1623076 + 293764 = 1274^2 + 542^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6782 + ... + 7058.

2^1916840 is an apocalyptic number.

1916840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a pronic number, being equal to 1384×1385.

It is an amenable number.

1916840 is an abundant number, since it is smaller than the sum of its proper divisors (2436640).

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

1916840 is a wasteful number, since it uses less digits than its factorization.

1916840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 1916840 is about 1384.4999097147. The cubic root of 1916840 is about 124.2210763049.

The spelling of 1916840 in words is "one million, nine hundred sixteen thousand, eight hundred forty".