43720440 has 32 divisors (see below), whose sum is σ = 131161680. Its totient is φ = 11658752.

The previous prime is 43720423. The next prime is 43720459. The reversal of 43720440 is 4402734.

It is a super-2 number, since 2×43720440² = 3822953747587200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 43720440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182049 + ... + 182288.

Almost surely, 2^43720440 is an apocalyptic number.

43720440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43720440 is an abundant number, since it is smaller than the sum of its proper divisors (87441240).

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

43720440 is a wasteful number, since it uses less digits than its factorization.

43720440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364351 (or 364347 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 24.

The square root of 43720440 is about 6612.1433741261. The cubic root of 43720440 is about 352.2855594279.

The spelling of 43720440 in words is "forty-three million, seven hundred twenty thousand, four hundred forty".