1388231424 has 324 divisors, whose sum is σ = 4496460696. Its totient is φ = 410370048.

The previous prime is 1388231399. The next prime is 1388231461. The reversal of 1388231424 is 4241328831.

It is a happy number.

1388231424 is a `hidden beast` number, since 1 + 388 + 231 + 42 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 20719839 + ... + 20719905.

Almost surely, 2^1388231424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1388231424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2248230348).

1388231424 is an abundant number, since it is smaller than the sum of its proper divisors (3108229272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1388231424 is a wasteful number, since it uses less digits than its factorization.

1388231424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152 (or 112 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 1388231424 is about 37258.9777637551. The cubic root of 1388231424 is about 1115.5455042195.

The spelling of 1388231424 in words is "one billion, three hundred eighty-eight million, two hundred thirty-one thousand, four hundred twenty-four".