43400121 has 8 divisors (see below), whose sum is σ = 58730784. Its totient is φ = 28501440.

The previous prime is 43400111. The next prime is 43400131. The reversal of 43400121 is 12100434.

It is an interprime number because it is at equal distance from previous prime (43400111) and next prime (43400131).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 43400121 - 2⁵ = 43400089 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 43400121.

It is not an unprimeable number, because it can be changed into a prime (43400101) 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, 107760 + ... + 108161.

It is an arithmetic number, because the mean of its divisors is an integer number (7341348).

Almost surely, 2^43400121 is an apocalyptic number.

It is an amenable number.

43400121 is a deficient number, since it is larger than the sum of its proper divisors (15330663).

43400121 is a wasteful number, since it uses less digits than its factorization.

43400121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215991.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 43400121 is about 6587.8768203420. The cubic root of 43400121 is about 351.4231064606.

Adding to 43400121 its reverse (12100434), we get a palindrome (55500555).

The spelling of 43400121 in words is "forty-three million, four hundred thousand, one hundred twenty-one".