53978399 has 2 divisors, whose sum is σ = 53978400. Its totient is φ = 53978398.

The previous prime is 53978387. The next prime is 53978413. The reversal of 53978399 is 99387935.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 53978399 - 2⁸ = 53978143 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 53978399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53978369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26989199 + 26989200.

It is an arithmetic number, because the mean of its divisors is an integer number (26989200).

Almost surely, 2^53978399 is an apocalyptic number.

53978399 is a deficient number, since it is larger than the sum of its proper divisors (1).

53978399 is an equidigital number, since it uses as much as digits as its factorization.

53978399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1837080, while the sum is 53.

The square root of 53978399 is about 7346.9993194501. Note that the first 3 decimals coincide. The cubic root of 53978399 is about 377.9259090716.

The spelling of 53978399 in words is "fifty-three million, nine hundred seventy-eight thousand, three hundred ninety-nine".