40345121 has 4 divisors (see below), whose sum is σ = 40556544. Its totient is φ = 40133700.

The previous prime is 40345103. The next prime is 40345139. The reversal of 40345121 is 12154304.

40345121 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 an interprime number because it is at equal distance from previous prime (40345103) and next prime (40345139).

It is a cyclic number.

It is not a de Polignac number, because 40345121 - 2⁶ = 40345057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40345093 and 40345102.

It is not an unprimeable number, because it can be changed into a prime (40345141) 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, 105425 + ... + 105806.

It is an arithmetic number, because the mean of its divisors is an integer number (10139136).

Almost surely, 2^40345121 is an apocalyptic number.

It is an amenable number.

40345121 is a deficient number, since it is larger than the sum of its proper divisors (211423).

40345121 is a wasteful number, since it uses less digits than its factorization.

40345121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211422.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 40345121 is about 6351.7809313609. The cubic root of 40345121 is about 342.9759550445.

Adding to 40345121 its reverse (12154304), we get a palindrome (52499425).

The spelling of 40345121 in words is "forty million, three hundred forty-five thousand, one hundred twenty-one".