40032121 has 4 divisors (see below), whose sum is σ = 41772672. Its totient is φ = 38291572.

The previous prime is 40032101. The next prime is 40032137. The reversal of 40032121 is 12123004.

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 40032121 - 2¹⁵ = 39999353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40032101) 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, 870241 + ... + 870286.

It is an arithmetic number, because the mean of its divisors is an integer number (10443168).

Almost surely, 2^40032121 is an apocalyptic number.

It is an amenable number.

40032121 is a deficient number, since it is larger than the sum of its proper divisors (1740551).

40032121 is a wasteful number, since it uses less digits than its factorization.

40032121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740550.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 40032121 is about 6327.0941987614. The cubic root of 40032121 is about 342.0867084046.

Adding to 40032121 its reverse (12123004), we get a palindrome (52155125).

The spelling of 40032121 in words is "forty million, thirty-two thousand, one hundred twenty-one".