43421390 has 16 divisors (see below), whose sum is σ = 80680320. Its totient is φ = 16808160.

The previous prime is 43421369. The next prime is 43421393. The reversal of 43421390 is 9312434.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43421393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69725 + ... + 70344.

It is an arithmetic number, because the mean of its divisors is an integer number (5042520).

Almost surely, 2^43421390 is an apocalyptic number.

43421390 is a deficient number, since it is larger than the sum of its proper divisors (37258930).

43421390 is a wasteful number, since it uses less digits than its factorization.

43421390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140107.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 43421390 is about 6589.4908756292. The cubic root of 43421390 is about 351.4805041300.

The spelling of 43421390 in words is "forty-three million, four hundred twenty-one thousand, three hundred ninety".