9278993 has 2 divisors, whose sum is σ = 9278994. Its totient is φ = 9278992.

The previous prime is 9278987. The next prime is 9279007. The reversal of 9278993 is 3998729.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8690704 + 588289 = 2948^2 + 767^2 .

It is a cyclic number.

It is not a de Polignac number, because 9278993 - 2²² = 5084689 is a prime.

It is a super-2 number, since 2×9278993² = 172199422188098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9278953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4639496 + 4639497.

It is an arithmetic number, because the mean of its divisors is an integer number (4639497).

Almost surely, 2^9278993 is an apocalyptic number.

It is an amenable number.

9278993 is a deficient number, since it is larger than the sum of its proper divisors (1).

9278993 is an equidigital number, since it uses as much as digits as its factorization.

9278993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 47.

The square root of 9278993 is about 3046.1439558892. The cubic root of 9278993 is about 210.1359135285.

The spelling of 9278993 in words is "nine million, two hundred seventy-eight thousand, nine hundred ninety-three".