43809420249 has 27 divisors (see below), whose sum is σ = 73619133237. Its totient is φ = 25031442744.

The previous prime is 43809420209. The next prime is 43809420251. The reversal of 43809420249 is 94202490834.

It is a happy number.

The square root of 43809420249 is 209307.

It is a perfect power (a square), and thus also a powerful number.

43809420249 is a `hidden beast` number, since 4 + 380 + 9 + 4 + 20 + 249 = 666.

It is not a de Polignac number, because 43809420249 - 2¹¹ = 43809418201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43809420209) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 4390464 + ... + 4400430.

Almost surely, 2^43809420249 is an apocalyptic number.

43809420249 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

43809420249 is the 209307-th square number.

43809420249 is the 104654-th centered octagonal number.

It is an amenable number.

43809420249 is a deficient number, since it is larger than the sum of its proper divisors (29809712988).

43809420249 is an frugal number, since it uses more digits than its factorization.

43809420249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19954 (or 9977 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The spelling of 43809420249 in words is "forty-three billion, eight hundred nine million, four hundred twenty thousand, two hundred forty-nine".