43209045 has 96 divisors (see below), whose sum is σ = 87744384. Its totient is φ = 20217600.

The previous prime is 43209031. The next prime is 43209073. The reversal of 43209045 is 54090234.

It is not a de Polignac number, because 43209045 - 2⁵ = 43209013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 708315 + ... + 708375.

It is an arithmetic number, because the mean of its divisors is an integer number (914004).

Almost surely, 2^43209045 is an apocalyptic number.

43209045 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

43209045 is an abundant number, since it is smaller than the sum of its proper divisors (44535339).

43209045 is a wasteful number, since it uses less digits than its factorization.

43209045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 43209045 is about 6573.3587305121. The cubic root of 43209045 is about 350.9066155252.

Adding to 43209045 its reverse (54090234), we get a palindrome (97299279).

The spelling of 43209045 in words is "forty-three million, two hundred nine thousand, forty-five".