40015121 has 4 divisors (see below), whose sum is σ = 42121200. Its totient is φ = 37909044.

The previous prime is 40015091. The next prime is 40015123. The reversal of 40015121 is 12151004.

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 a de Polignac number, because none of the positive numbers 2^k-40015121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40015096 and 40015105.

It is not an unprimeable number, because it can be changed into a prime (40015123) 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, 1053011 + ... + 1053048.

It is an arithmetic number, because the mean of its divisors is an integer number (10530300).

Almost surely, 2^40015121 is an apocalyptic number.

It is an amenable number.

40015121 is a deficient number, since it is larger than the sum of its proper divisors (2106079).

40015121 is a wasteful number, since it uses less digits than its factorization.

40015121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106078.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 40015121 is about 6325.7506273959. The cubic root of 40015121 is about 342.0382781501.

Adding to 40015121 its reverse (12151004), we get a palindrome (52166125).

The spelling of 40015121 in words is "forty million, fifteen thousand, one hundred twenty-one".