388481869 has 4 divisors (see below), whose sum is σ = 388522080. Its totient is φ = 388441660.

The previous prime is 388481867. The next prime is 388481881. The reversal of 388481869 is 968184883.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 968184883 = 37 ⋅26167159.

It is a cyclic number.

It is not a de Polignac number, because 388481869 - 2¹ = 388481867 is a prime.

It is a super-2 number, since 2×388481869² = 301836325083466322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388481861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4104 + ... + 28174.

It is an arithmetic number, because the mean of its divisors is an integer number (97130520).

Almost surely, 2^388481869 is an apocalyptic number.

It is an amenable number.

388481869 is a deficient number, since it is larger than the sum of its proper divisors (40211).

388481869 is a wasteful number, since it uses less digits than its factorization.

388481869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40210.

The product of its digits is 2654208, while the sum is 55.

The square root of 388481869 is about 19709.9434042820. The cubic root of 388481869 is about 729.6651175563.

The spelling of 388481869 in words is "three hundred eighty-eight million, four hundred eighty-one thousand, eight hundred sixty-nine".