43421913 has 12 divisors (see below), whose sum is σ = 65043888. Its totient is φ = 28947780.

The previous prime is 43421909. The next prime is 43421923. The reversal of 43421913 is 31912434.

43421913 is a `hidden beast` number, since 434 + 219 + 13 = 666.

It is not a de Polignac number, because 43421913 - 2² = 43421909 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (43421923) 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, 89103 + ... + 89588.

It is an arithmetic number, because the mean of its divisors is an integer number (5420324).

Almost surely, 2^43421913 is an apocalyptic number.

It is an amenable number.

43421913 is a deficient number, since it is larger than the sum of its proper divisors (21621975).

43421913 is an equidigital number, since it uses as much as digits as its factorization.

43421913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178706 (or 178694 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 43421913 is about 6589.5305599109. The cubic root of 43421913 is about 351.4819152899.

The spelling of 43421913 in words is "forty-three million, four hundred twenty-one thousand, nine hundred thirteen".