40120521 has 16 divisors (see below), whose sum is σ = 61277184. Its totient is φ = 22873104.

The previous prime is 40120519. The next prime is 40120529. The reversal of 40120521 is 12502104.

It is not a de Polignac number, because 40120521 - 2¹ = 40120519 is a prime.

It is a super-2 number, since 2×40120521² = 3219312410622882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40120521.

It is not an unprimeable number, because it can be changed into a prime (40120529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8266 + ... + 12188.

It is an arithmetic number, because the mean of its divisors is an integer number (3829824).

Almost surely, 2^40120521 is an apocalyptic number.

It is an amenable number.

40120521 is a deficient number, since it is larger than the sum of its proper divisors (21156663).

40120521 is a wasteful number, since it uses less digits than its factorization.

40120521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4420.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 40120521 is about 6334.0761757339. The cubic root of 40120521 is about 342.3383249588.

Adding to 40120521 its reverse (12502104), we get a palindrome (52622625).

The spelling of 40120521 in words is "forty million, one hundred twenty thousand, five hundred twenty-one".