1855428 has 12 divisors (see below), whose sum is σ = 4329360. Its totient is φ = 618472.

The previous prime is 1855423. The next prime is 1855457. The reversal of 1855428 is 8245581.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1855428² = 6885226126368, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1855421) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 77298 + ... + 77321.

It is an arithmetic number, because the mean of its divisors is an integer number (360780).

2^1855428 is an apocalyptic number.

It is an amenable number.

1855428 is an abundant number, since it is smaller than the sum of its proper divisors (2473932).

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

1855428 is a wasteful number, since it uses less digits than its factorization.

1855428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154626 (or 154624 counting only the distinct ones).

The product of its digits is 12800, while the sum is 33.

The square root of 1855428 is about 1362.1409618685. The cubic root of 1855428 is about 122.8800469801.

The spelling of 1855428 in words is "one million, eight hundred fifty-five thousand, four hundred twenty-eight".