1387814538 has 64 divisors (see below), whose sum is σ = 3108979584. Its totient is φ = 409440000.

The previous prime is 1387814509. The next prime is 1387814563. The reversal of 1387814538 is 8354187831.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 404920 + ... + 408332.

It is an arithmetic number, because the mean of its divisors is an integer number (48577806).

Almost surely, 2^1387814538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1387814538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1554489792).

1387814538 is an abundant number, since it is smaller than the sum of its proper divisors (1721165046).

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

1387814538 is a wasteful number, since it uses less digits than its factorization.

1387814538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3591.

The product of its digits is 645120, while the sum is 48.

The square root of 1387814538 is about 37253.3829067912. The cubic root of 1387814538 is about 1115.4338269072.

The spelling of 1387814538 in words is "one billion, three hundred eighty-seven million, eight hundred fourteen thousand, five hundred thirty-eight".