43645240 has 32 divisors (see below), whose sum is σ = 99553680. Its totient is φ = 17217792.

The previous prime is 43645183. The next prime is 43645249. The reversal of 43645240 is 4254634.

It is a junction number, because it is equal to n+sod(n) for n = 43645199 and 43645208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43645249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4554 + ... + 10393.

Almost surely, 2^43645240 is an apocalyptic number.

43645240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43645240 is an abundant number, since it is smaller than the sum of its proper divisors (55908440).

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

43645240 is a wasteful number, since it uses less digits than its factorization.

43645240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15031 (or 15027 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 43645240 is about 6606.4544197323. The cubic root of 43645240 is about 352.0834641955.

Adding to 43645240 its reverse (4254634), we get a palindrome (47899874).

It can be divided in two parts, 4364 and 5240, that added together give a square (9604 = 98²).

The spelling of 43645240 in words is "forty-three million, six hundred forty-five thousand, two hundred forty".