40023121 has 4 divisors (see below), whose sum is σ = 40105792. Its totient is φ = 39940452.

The previous prime is 40023119. The next prime is 40023127. The reversal of 40023121 is 12132004.

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 40023121 - 2¹ = 40023119 is a prime.

It is a super-3 number, since 3×40023121³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40023127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40605 + ... + 41578.

It is an arithmetic number, because the mean of its divisors is an integer number (10026448).

Almost surely, 2^40023121 is an apocalyptic number.

It is an amenable number.

40023121 is a deficient number, since it is larger than the sum of its proper divisors (82671).

40023121 is an equidigital number, since it uses as much as digits as its factorization.

40023121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82670.

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

The square root of 40023121 is about 6326.3829318181. The cubic root of 40023121 is about 342.0610705664.

Adding to 40023121 its reverse (12132004), we get a palindrome (52155125).

The spelling of 40023121 in words is "forty million, twenty-three thousand, one hundred twenty-one".