43400440 has 16 divisors (see below), whose sum is σ = 97651080. Its totient is φ = 17360160.

The previous prime is 43400429. The next prime is 43400447. The reversal of 43400440 is 4400434.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43400447) 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, 542466 + ... + 542545.

Almost surely, 2^43400440 is an apocalyptic number.

43400440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43400440 is an abundant number, since it is smaller than the sum of its proper divisors (54250640).

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

43400440 is a wasteful number, since it uses less digits than its factorization.

43400440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085022 (or 1085018 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 43400440 is about 6587.9010314363. The cubic root of 43400440 is about 351.4239674697.

Adding to 43400440 its reverse (4400434), we get a palindrome (47800874).

The spelling of 43400440 in words is "forty-three million, four hundred thousand, four hundred forty".