40043121 has 4 divisors (see below), whose sum is σ = 53390832. Its totient is φ = 26695412.

The previous prime is 40043119. The next prime is 40043141. The reversal of 40043121 is 12134004.

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 40043121 - 2¹ = 40043119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40043121.

It is not an unprimeable number, because it can be changed into a prime (40043111) 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, 6673851 + ... + 6673856.

It is an arithmetic number, because the mean of its divisors is an integer number (13347708).

Almost surely, 2^40043121 is an apocalyptic number.

It is an amenable number.

40043121 is a deficient number, since it is larger than the sum of its proper divisors (13347711).

40043121 is a wasteful number, since it uses less digits than its factorization.

40043121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13347710.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 40043121 is about 6327.9634164556. The cubic root of 40043121 is about 342.1180383225.

Adding to 40043121 its reverse (12134004), we get a palindrome (52177125).

The spelling of 40043121 in words is "forty million, forty-three thousand, one hundred twenty-one".