43854121 has 2 divisors, whose sum is σ = 43854122. Its totient is φ = 43854120.

The previous prime is 43854091. The next prime is 43854137. The reversal of 43854121 is 12145834.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36905625 + 6948496 = 6075^2 + 2636^2 .

It is a cyclic number.

It is not a de Polignac number, because 43854121 - 2⁷ = 43853993 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 43854121.

It is not a weakly prime, because it can be changed into another prime (43854191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21927060 + 21927061.

It is an arithmetic number, because the mean of its divisors is an integer number (21927061).

Almost surely, 2^43854121 is an apocalyptic number.

It is an amenable number.

43854121 is a deficient number, since it is larger than the sum of its proper divisors (1).

43854121 is an equidigital number, since it uses as much as digits as its factorization.

43854121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 28.

The square root of 43854121 is about 6622.2444080538. The cubic root of 43854121 is about 352.6442472533.

Adding to 43854121 its reverse (12145834), we get a palindrome (55999955).

The spelling of 43854121 in words is "forty-three million, eight hundred fifty-four thousand, one hundred twenty-one".