43840051 has 4 divisors (see below), whose sum is σ = 43860832. Its totient is φ = 43819272.

The previous prime is 43840037. The next prime is 43840057. The reversal of 43840051 is 15004834.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 43840051 - 2¹⁷ = 43708979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 43839998 and 43840025.

It is not an unprimeable number, because it can be changed into a prime (43840057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6816 + ... + 11581.

It is an arithmetic number, because the mean of its divisors is an integer number (10965208).

Almost surely, 2^43840051 is an apocalyptic number.

43840051 is a deficient number, since it is larger than the sum of its proper divisors (20781).

43840051 is a wasteful number, since it uses less digits than its factorization.

43840051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20780.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 43840051 is about 6621.1819941760. The cubic root of 43840051 is about 352.6065295112.

Adding to 43840051 its reverse (15004834), we get a palindrome (58844885).

The spelling of 43840051 in words is "forty-three million, eight hundred forty thousand, fifty-one".