1388831384 has 16 divisors (see below), whose sum is σ = 2621538000. Its totient is φ = 689754592.

The previous prime is 1388831317. The next prime is 1388831387. The reversal of 1388831384 is 4831388831.

It is a happy number.

It is a super-2 number, since 2×1388831384² = 3857705226366710912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388831387) 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, 581372 + ... + 583755.

It is an arithmetic number, because the mean of its divisors is an integer number (163846125).

Almost surely, 2^1388831384 is an apocalyptic number.

It is an amenable number.

1388831384 is a deficient number, since it is larger than the sum of its proper divisors (1232706616).

1388831384 is a wasteful number, since it uses less digits than its factorization.

1388831384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1165282 (or 1165278 counting only the distinct ones).

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

The square root of 1388831384 is about 37267.0281079670. The cubic root of 1388831384 is about 1115.7061849908.

The spelling of 1388831384 in words is "one billion, three hundred eighty-eight million, eight hundred thirty-one thousand, three hundred eighty-four".