43649440 has 24 divisors (see below), whose sum is σ = 103122180. Its totient is φ = 17459712.

The previous prime is 43649399. The next prime is 43649449. The reversal of 43649440 is 4494634.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 41938576 + 1710864 = 6476^2 + 1308^2 .

It is a super-2 number, since 2×43649440² = 3810547224627200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43649396 and 43649405.

It is not an unprimeable number, because it can be changed into a prime (43649449) 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, 136245 + ... + 136564.

Almost surely, 2^43649440 is an apocalyptic number.

43649440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43649440 is an abundant number, since it is smaller than the sum of its proper divisors (59472740).

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

43649440 is a wasteful number, since it uses less digits than its factorization.

43649440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272824 (or 272816 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 43649440 is about 6606.7722830441. The cubic root of 43649440 is about 352.0947575471.

The spelling of 43649440 in words is "forty-three million, six hundred forty-nine thousand, four hundred forty".