43409925 has 120 divisors (see below), whose sum is σ = 92634696. Its totient is φ = 19906560.

The previous prime is 43409923. The next prime is 43409929. The reversal of 43409925 is 52990434.

It can be written as a sum of positive squares in 12 ways, for example, as 14152644 + 29257281 = 3762^2 + 5409^2 .

It is not a de Polignac number, because 43409925 - 2¹ = 43409923 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 43409925.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43409923) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 447477 + ... + 447573.

Almost surely, 2^43409925 is an apocalyptic number.

43409925 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

43409925 is an abundant number, since it is smaller than the sum of its proper divisors (49224771).

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

43409925 is a wasteful number, since it uses less digits than its factorization.

43409925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 135 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 43409925 is about 6588.6208723829. The cubic root of 43409925 is about 351.4495663925.

The spelling of 43409925 in words is "forty-three million, four hundred nine thousand, nine hundred twenty-five".