40542121 has 4 divisors (see below), whose sum is σ = 41637892. Its totient is φ = 39446352.

The previous prime is 40542119. The next prime is 40542167. The reversal of 40542121 is 12124504.

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

It can be written as a sum of positive squares in 2 ways, for example, as 25050025 + 15492096 = 5005^2 + 3936^2 .

It is a cyclic number.

It is not a de Polignac number, because 40542121 - 2¹ = 40542119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40542101) 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, 547830 + ... + 547903.

It is an arithmetic number, because the mean of its divisors is an integer number (10409473).

Almost surely, 2^40542121 is an apocalyptic number.

It is an amenable number.

40542121 is a deficient number, since it is larger than the sum of its proper divisors (1095771).

40542121 is a wasteful number, since it uses less digits than its factorization.

40542121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095770.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 40542121 is about 6367.2695089811. The cubic root of 40542121 is about 343.5332846248.

Adding to 40542121 its reverse (12124504), we get a palindrome (52666625).

The spelling of 40542121 in words is "forty million, five hundred forty-two thousand, one hundred twenty-one".