1387518790 has 24 divisors (see below), whose sum is σ = 2905295472. Its totient is φ = 475720560.

The previous prime is 1387518779. The next prime is 1387518799. The reversal of 1387518790 is 978157831.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1387518799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1415346 + ... + 1416325.

It is an arithmetic number, because the mean of its divisors is an integer number (121053978).

Almost surely, 2^1387518790 is an apocalyptic number.

1387518790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1387518790 is an abundant number, since it is smaller than the sum of its proper divisors (1517776682).

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

1387518790 is a wasteful number, since it uses less digits than its factorization.

1387518790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2831692 (or 2831685 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 49.

The square root of 1387518790 is about 37249.4132839700. The cubic root of 1387518790 is about 1115.3545870302.

The spelling of 1387518790 in words is "one billion, three hundred eighty-seven million, five hundred eighteen thousand, seven hundred ninety".