40520121 has 4 divisors (see below), whose sum is σ = 54026832. Its totient is φ = 27013412.

The previous prime is 40520111. The next prime is 40520149. The reversal of 40520121 is 12102504.

40520121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40520121 - 2⁶ = 40520057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40520121.

It is not an unprimeable number, because it can be changed into a prime (40520111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6753351 + ... + 6753356.

It is an arithmetic number, because the mean of its divisors is an integer number (13506708).

Almost surely, 2^40520121 is an apocalyptic number.

It is an amenable number.

40520121 is a deficient number, since it is larger than the sum of its proper divisors (13506711).

40520121 is a wasteful number, since it uses less digits than its factorization.

40520121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13506710.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 40520121 is about 6365.5416894401. The cubic root of 40520121 is about 343.4711344499.

Adding to 40520121 its reverse (12102504), we get a palindrome (52622625).

The spelling of 40520121 in words is "forty million, five hundred twenty thousand, one hundred twenty-one".