385978477 has 2 divisors, whose sum is σ = 385978478. Its totient is φ = 385978476.

The previous prime is 385978451. The next prime is 385978573. The reversal of 385978477 is 774879583.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 325044841 + 60933636 = 18029^2 + 7806^2 .

It is a cyclic number.

It is not a de Polignac number, because 385978477 - 2⁷ = 385978349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (385978447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192989238 + 192989239.

It is an arithmetic number, because the mean of its divisors is an integer number (192989239).

Almost surely, 2^385978477 is an apocalyptic number.

It is an amenable number.

385978477 is a deficient number, since it is larger than the sum of its proper divisors (1).

385978477 is an equidigital number, since it uses as much as digits as its factorization.

385978477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11854080, while the sum is 58.

The square root of 385978477 is about 19646.3349508248. The cubic root of 385978477 is about 728.0944088457.

It can be divided in two parts, 38597 and 8477, that added together give a palindrome (47074).

The spelling of 385978477 in words is "three hundred eighty-five million, nine hundred seventy-eight thousand, four hundred seventy-seven".