388249481 has 2 divisors, whose sum is σ = 388249482. Its totient is φ = 388249480.

The previous prime is 388249457. The next prime is 388249483. The reversal of 388249481 is 184942883.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 353628025 + 34621456 = 18805^2 + 5884^2 .

It is an emirp because it is prime and its reverse (184942883) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 388249481 - 2¹⁰ = 388248457 is a prime.

It is a super-2 number, since 2×388249481² = 301475318993538722, which contains 22 as substring.

Together with 388249483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (388249483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194124740 + 194124741.

It is an arithmetic number, because the mean of its divisors is an integer number (194124741).

Almost surely, 2^388249481 is an apocalyptic number.

It is an amenable number.

388249481 is a deficient number, since it is larger than the sum of its proper divisors (1).

388249481 is an equidigital number, since it uses as much as digits as its factorization.

388249481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 442368, while the sum is 47.

The square root of 388249481 is about 19704.0473253593. The cubic root of 388249481 is about 729.5195944717.

The spelling of 388249481 in words is "three hundred eighty-eight million, two hundred forty-nine thousand, four hundred eighty-one".