2181428 has 12 divisors (see below), whose sum is σ = 4018560. Its totient is φ = 1033272.

The previous prime is 2181419. The next prime is 2181449. The reversal of 2181428 is 8241812.

It is a junction number, because it is equal to n+sod(n) for n = 2181397 and 2181406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14276 + ... + 14427.

It is an arithmetic number, because the mean of its divisors is an integer number (334880).

2^2181428 is an apocalyptic number.

It is an amenable number.

2181428 is a deficient number, since it is larger than the sum of its proper divisors (1837132).

2181428 is a wasteful number, since it uses less digits than its factorization.

2181428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28726 (or 28724 counting only the distinct ones).

The product of its digits is 1024, while the sum is 26.

The square root of 2181428 is about 1476.9658086767. The cubic root of 2181428 is about 129.6921314357.

The spelling of 2181428 in words is "two million, one hundred eighty-one thousand, four hundred twenty-eight".