7478729 has 2 divisors, whose sum is σ = 7478730. Its totient is φ = 7478728.

The previous prime is 7478717. The next prime is 7478743. The reversal of 7478729 is 9278747.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6901129 + 577600 = 2627^2 + 760^2 .

It is a cyclic number.

It is not a de Polignac number, because 7478729 - 2¹² = 7474633 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 7478729.

It is not a weakly prime, because it can be changed into another prime (7478129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3739364 + 3739365.

It is an arithmetic number, because the mean of its divisors is an integer number (3739365).

Almost surely, 2^7478729 is an apocalyptic number.

It is an amenable number.

7478729 is a deficient number, since it is larger than the sum of its proper divisors (1).

7478729 is an equidigital number, since it uses as much as digits as its factorization.

7478729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 197568, while the sum is 44.

The square root of 7478729 is about 2734.7264945511. The cubic root of 7478729 is about 195.5581553952.

The spelling of 7478729 in words is "seven million, four hundred seventy-eight thousand, seven hundred twenty-nine".