7521427 has 4 divisors (see below), whose sum is σ = 7537000. Its totient is φ = 7505856.

The previous prime is 7521421. The next prime is 7521433. The reversal of 7521427 is 7241257.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (7521421) and next prime (7521433).

It is a cyclic number.

It is not a de Polignac number, because 7521427 - 2¹⁵ = 7488659 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7521395 and 7521404.

It is not an unprimeable number, because it can be changed into a prime (7521421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7038 + ... + 8035.

It is an arithmetic number, because the mean of its divisors is an integer number (1884250).

Almost surely, 2^7521427 is an apocalyptic number.

7521427 is a deficient number, since it is larger than the sum of its proper divisors (15573).

7521427 is a wasteful number, since it uses less digits than its factorization.

7521427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15572.

The product of its digits is 3920, while the sum is 28.

The square root of 7521427 is about 2742.5220144969. The cubic root of 7521427 is about 195.9296134183.

The spelling of 7521427 in words is "seven million, five hundred twenty-one thousand, four hundred twenty-seven".