1387775500 has 24 divisors (see below), whose sum is σ = 3030902784. Its totient is φ = 555110000.

The previous prime is 1387775497. The next prime is 1387775509. The reversal of 1387775500 is 55777831.

It is not an unprimeable number, because it can be changed into a prime (1387775509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1387276 + ... + 1388275.

It is an arithmetic number, because the mean of its divisors is an integer number (126287616).

Almost surely, 2^1387775500 is an apocalyptic number.

1387775500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1387775500 is an abundant number, since it is smaller than the sum of its proper divisors (1643127284).

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

1387775500 is a wasteful number, since it uses less digits than its factorization.

1387775500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2775570 (or 2775558 counting only the distinct ones).

The product of its (nonzero) digits is 205800, while the sum is 43.

The square root of 1387775500 is about 37252.8589506899. The cubic root of 1387775500 is about 1115.4233680856.

The spelling of 1387775500 in words is "one billion, three hundred eighty-seven million, seven hundred seventy-five thousand, five hundred".