43450040 has 16 divisors (see below), whose sum is σ = 97762680. Its totient is φ = 17380000.

The previous prime is 43450031. The next prime is 43450097. The reversal of 43450040 is 4005434.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 43449994 and 43450021.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 543086 + ... + 543165.

Almost surely, 2^43450040 is an apocalyptic number.

43450040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43450040 is an abundant number, since it is smaller than the sum of its proper divisors (54312640).

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

43450040 is a wasteful number, since it uses less digits than its factorization.

43450040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1086262 (or 1086258 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 43450040 is about 6591.6644332065. The cubic root of 43450040 is about 351.5577909427.

Adding to 43450040 its reverse (4005434), we get a palindrome (47455474).

The spelling of 43450040 in words is "forty-three million, four hundred fifty thousand, forty".