7521643 has 8 divisors (see below), whose sum is σ = 7812000. Its totient is φ = 7233408.

The previous prime is 7521641. The next prime is 7521649. The reversal of 7521643 is 3461257.

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 7521643 - 2¹ = 7521641 is a prime.

It is a super-2 number, since 2×7521643² = 113150226838898, which contains 22 as substring.

It is a Duffinian number.

7521643 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7521641) 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 7 ways as a sum of consecutive naturals, for example, 12258 + ... + 12856.

It is an arithmetic number, because the mean of its divisors is an integer number (976500).

Almost surely, 2^7521643 is an apocalyptic number.

7521643 is a deficient number, since it is larger than the sum of its proper divisors (290357).

7521643 is a wasteful number, since it uses less digits than its factorization.

7521643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061.

The product of its digits is 5040, while the sum is 28.

The square root of 7521643 is about 2742.5613940257. The cubic root of 7521643 is about 195.9314889663.

The spelling of 7521643 in words is "seven million, five hundred twenty-one thousand, six hundred forty-three".