43742121 has 16 divisors (see below), whose sum is σ = 61810560. Its totient is φ = 27466880.

The previous prime is 43742117. The next prime is 43742131. The reversal of 43742121 is 12124734.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 43742121 - 2² = 43742117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 43742091 and 43742100.

It is not an unprimeable number, because it can be changed into a prime (43742131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2565 + ... + 9698.

It is an arithmetic number, because the mean of its divisors is an integer number (3863160).

Almost surely, 2^43742121 is an apocalyptic number.

43742121 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

43742121 is a deficient number, since it is larger than the sum of its proper divisors (18068439).

43742121 is a wasteful number, since it uses less digits than its factorization.

43742121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12336.

The product of its digits is 1344, while the sum is 24.

The square root of 43742121 is about 6613.7826544270. The cubic root of 43742121 is about 352.3437826984.

Adding to 43742121 its reverse (12124734), we get a palindrome (55866855).

The spelling of 43742121 in words is "forty-three million, seven hundred forty-two thousand, one hundred twenty-one".