388981249 has 4 divisors (see below), whose sum is σ = 389212164. Its totient is φ = 388750336.

The previous prime is 388981247. The next prime is 388981253. The reversal of 388981249 is 942189883.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 187142400 + 201838849 = 13680^2 + 14207^2 .

It is a cyclic number.

It is not a de Polignac number, because 388981249 - 2¹ = 388981247 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 388981196 and 388981205.

It is not an unprimeable number, because it can be changed into a prime (388981247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112912 + ... + 116305.

It is an arithmetic number, because the mean of its divisors is an integer number (97303041).

Almost surely, 2^388981249 is an apocalyptic number.

It is an amenable number.

388981249 is a deficient number, since it is larger than the sum of its proper divisors (230915).

388981249 is a wasteful number, since it uses less digits than its factorization.

388981249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230914.

The product of its digits is 995328, while the sum is 52.

The square root of 388981249 is about 19722.6075608678. The cubic root of 388981249 is about 729.9776367704.

The spelling of 388981249 in words is "three hundred eighty-eight million, nine hundred eighty-one thousand, two hundred forty-nine".