7427121 has 16 divisors (see below), whose sum is σ = 10954944. Its totient is φ = 4446144.

The previous prime is 7427117. The next prime is 7427131. The reversal of 7427121 is 1217247.

7427121 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 7427121 - 2² = 7427117 is a prime.

7427121 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 7427091 and 7427100.

It is not an unprimeable number, because it can be changed into a prime (7427131) 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, 1131 + ... + 4016.

It is an arithmetic number, because the mean of its divisors is an integer number (684684).

Almost surely, 2^7427121 is an apocalyptic number.

It is an amenable number.

7427121 is a deficient number, since it is larger than the sum of its proper divisors (3527823).

7427121 is a wasteful number, since it uses less digits than its factorization.

7427121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5200.

The product of its digits is 784, while the sum is 24.

The square root of 7427121 is about 2725.2744815890. The cubic root of 7427121 is about 195.1072913835.

The spelling of 7427121 in words is "seven million, four hundred twenty-seven thousand, one hundred twenty-one".