1840140 has 36 divisors (see below), whose sum is σ = 5582304. Its totient is φ = 490656.

The previous prime is 1840123. The next prime is 1840171. The reversal of 1840140 is 410481.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1840140² = 6772230439200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4932 + ... + 5291.

It is an arithmetic number, because the mean of its divisors is an integer number (155064).

2^1840140 is an apocalyptic number.

1840140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1840140 is an abundant number, since it is smaller than the sum of its proper divisors (3742164).

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

1840140 is a wasteful number, since it uses less digits than its factorization.

1840140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10238 (or 10233 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1840140 is about 1356.5176003281. The cubic root of 1840140 is about 122.5416212866.

The spelling of 1840140 in words is "one million, eight hundred forty thousand, one hundred forty".