2209428 has 36 divisors (see below), whose sum is σ = 6015828. Its totient is φ = 679680.

The previous prime is 2209421. The next prime is 2209447. The reversal of 2209428 is 8249022.

It can be written as a sum of positive squares in 2 ways, for example, as 725904 + 1483524 = 852^2 + 1218^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2209421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1893 + ... + 2828.

2^2209428 is an apocalyptic number.

It is an amenable number.

2209428 is an abundant number, since it is smaller than the sum of its proper divisors (3806400).

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

2209428 is a wasteful number, since it uses less digits than its factorization.

2209428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4744 (or 4739 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 2209428 is about 1486.4144778628. The cubic root of 2209428 is about 130.2446674381.

It can be divided in two parts, 22094 and 28, that added together give a palindrome (22122).

The spelling of 2209428 in words is "two million, two hundred nine thousand, four hundred twenty-eight".