7540621 has 4 divisors (see below), whose sum is σ = 8226144. Its totient is φ = 6855100.

The previous prime is 7540601. The next prime is 7540651. The reversal of 7540621 is 1260457.

7540621 is digitally balanced in base 3, 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 a cyclic number.

It is not a de Polignac number, because 7540621 - 2¹⁵ = 7507853 is a prime.

It is a Duffinian number.

7540621 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7540601) 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, 342745 + ... + 342766.

It is an arithmetic number, because the mean of its divisors is an integer number (2056536).

Almost surely, 2^7540621 is an apocalyptic number.

It is an amenable number.

7540621 is a deficient number, since it is larger than the sum of its proper divisors (685523).

7540621 is a wasteful number, since it uses less digits than its factorization.

7540621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685522.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 7540621 is about 2746.0191186516. The cubic root of 7540621 is about 196.0961367196.

The spelling of 7540621 in words is "seven million, five hundred forty thousand, six hundred twenty-one".