43720407 has 12 divisors (see below), whose sum is σ = 63474840. Its totient is φ = 28997808.

The previous prime is 43720373. The next prime is 43720423. The reversal of 43720407 is 70402734.

It is not a de Polignac number, because 43720407 - 2⁷ = 43720279 is a prime.

It is a super-2 number, since 2×43720407² = 3822947976491298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43720507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10557 + ... + 14102.

It is an arithmetic number, because the mean of its divisors is an integer number (5289570).

Almost surely, 2^43720407 is an apocalyptic number.

43720407 is a deficient number, since it is larger than the sum of its proper divisors (19754433).

43720407 is a wasteful number, since it uses less digits than its factorization.

43720407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24862 (or 24859 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 27.

The square root of 43720407 is about 6612.1408787170. The cubic root of 43720407 is about 352.2854707933.

The spelling of 43720407 in words is "forty-three million, seven hundred twenty thousand, four hundred seven".