1840428 has 24 divisors (see below), whose sum is σ = 4771760. Its totient is φ = 613440.

The previous prime is 1840393. The next prime is 1840429. The reversal of 1840428 is 8240481.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1840429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8413 + ... + 8628.

2^1840428 is an apocalyptic number.

1840428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1840428 is an abundant number, since it is smaller than the sum of its proper divisors (2931332).

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

1840428 is a wasteful number, since it uses less digits than its factorization.

1840428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17054 (or 17046 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The square root of 1840428 is about 1356.6237503450. The cubic root of 1840428 is about 122.5480139426.

The spelling of 1840428 in words is "one million, eight hundred forty thousand, four hundred twenty-eight".