43609440 has 96 divisors (see below), whose sum is σ = 157006080. Its totient is φ = 9967104.

The previous prime is 43609393. The next prime is 43609441. The reversal of 43609440 is 4490634.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×43609440² = 3803566514227200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 43609398 and 43609407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43609441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3130 + ... + 9849.

It is an arithmetic number, because the mean of its divisors is an integer number (1635480).

Almost surely, 2^43609440 is an apocalyptic number.

43609440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43609440 is an abundant number, since it is smaller than the sum of its proper divisors (113396640).

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

43609440 is a wasteful number, since it uses less digits than its factorization.

43609440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13004 (or 12996 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 43609440 is about 6603.7443923883. The cubic root of 43609440 is about 351.9871723976.

The spelling of 43609440 in words is "forty-three million, six hundred nine thousand, four hundred forty".