1831428 has 18 divisors (see below), whose sum is σ = 4629534. Its totient is φ = 610464.

The previous prime is 1831411. The next prime is 1831441. The reversal of 1831428 is 8241381.

It can be written as a sum of positive squares in only one way, i.e., 1617984 + 213444 = 1272^2 + 462^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25401 + ... + 25472.

2^1831428 is an apocalyptic number.

1831428 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1831428 is an abundant number, since it is smaller than the sum of its proper divisors (2798106).

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

1831428 is a wasteful number, since it uses less digits than its factorization.

1831428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50883 (or 50878 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 1831428 is about 1353.3026269094. The cubic root of 1831428 is about 122.3479273565.

The spelling of 1831428 in words is "one million, eight hundred thirty-one thousand, four hundred twenty-eight".