40251521 has 8 divisors (see below), whose sum is σ = 41033088. Its totient is φ = 39474000.

The previous prime is 40251517. The next prime is 40251553. The reversal of 40251521 is 12515204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40251521 - 2² = 40251517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40251493 and 40251502.

It is not an unprimeable number, because it can be changed into a prime (40251571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25526 + ... + 27056.

It is an arithmetic number, because the mean of its divisors is an integer number (5129136).

Almost surely, 2^40251521 is an apocalyptic number.

It is an amenable number.

40251521 is a deficient number, since it is larger than the sum of its proper divisors (781567).

40251521 is a wasteful number, since it uses less digits than its factorization.

40251521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 40251521 is about 6344.4086406851. The cubic root of 40251521 is about 342.7105168582.

Adding to 40251521 its reverse (12515204), we get a palindrome (52766725).

The spelling of 40251521 in words is "forty million, two hundred fifty-one thousand, five hundred twenty-one".