43209428 has 12 divisors (see below), whose sum is σ = 75701472. Its totient is φ = 21580440.

The previous prime is 43209421. The next prime is 43209431. The reversal of 43209428 is 82490234.

It is a junction number, because it is equal to n+sod(n) for n = 43209394 and 43209403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43209421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1718 + ... + 9453.

It is an arithmetic number, because the mean of its divisors is an integer number (6308456).

Almost surely, 2^43209428 is an apocalyptic number.

It is an amenable number.

43209428 is a deficient number, since it is larger than the sum of its proper divisors (32492044).

43209428 is a wasteful number, since it uses less digits than its factorization.

43209428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12142 (or 12140 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 43209428 is about 6573.3878631951. The cubic root of 43209428 is about 350.9076523207.

The spelling of 43209428 in words is "forty-three million, two hundred nine thousand, four hundred twenty-eight".