7478129 has 2 divisors, whose sum is σ = 7478130. Its totient is φ = 7478128.

The previous prime is 7478117. The next prime is 7478131. The reversal of 7478129 is 9218747.

7478129 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4092529 + 3385600 = 2023^2 + 1840^2 .

It is a cyclic number.

It is not a de Polignac number, because 7478129 - 2¹⁶ = 7412593 is a prime.

It is a Sophie Germain prime.

Together with 7478131, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 7478092 and 7478101.

It is not a weakly prime, because it can be changed into another prime (7478189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3739064 + 3739065.

It is an arithmetic number, because the mean of its divisors is an integer number (3739065).

Almost surely, 2^7478129 is an apocalyptic number.

It is an amenable number.

7478129 is a deficient number, since it is larger than the sum of its proper divisors (1).

7478129 is an equidigital number, since it uses as much as digits as its factorization.

7478129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 38.

The square root of 7478129 is about 2734.6167921667. The cubic root of 7478129 is about 195.5529255390.

The spelling of 7478129 in words is "seven million, four hundred seventy-eight thousand, one hundred twenty-nine".