1387945998 has 24 divisors (see below), whose sum is σ = 3088493928. Its totient is φ = 450144432.

The previous prime is 1387945969. The next prime is 1387946047. The reversal of 1387945998 is 8995497831.

1387945998 is a `hidden beast` number, since 1 + 38 + 7 + 9 + 4 + 599 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1041336 + ... + 1042667.

It is an arithmetic number, because the mean of its divisors is an integer number (128687247).

Almost surely, 2^1387945998 is an apocalyptic number.

1387945998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1387945998 is an abundant number, since it is smaller than the sum of its proper divisors (1700547930).

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

1387945998 is a wasteful number, since it uses less digits than its factorization.

1387945998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2084048 (or 2084045 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 63.

The square root of 1387945998 is about 37255.1472685319. The cubic root of 1387945998 is about 1115.4690454221.

The spelling of 1387945998 in words is "one billion, three hundred eighty-seven million, nine hundred forty-five thousand, nine hundred ninety-eight".