1387512740 has 12 divisors (see below), whose sum is σ = 2913776796. Its totient is φ = 555005088.

The previous prime is 1387512739. The next prime is 1387512751. The reversal of 1387512740 is 472157831.

It can be written as a sum of positive squares in 2 ways, for example, as 1078596964 + 308915776 = 32842^2 + 17576^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1387512694 and 1387512703.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34687799 + ... + 34687838.

It is an arithmetic number, because the mean of its divisors is an integer number (242814733).

Almost surely, 2^1387512740 is an apocalyptic number.

1387512740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1387512740 is an abundant number, since it is smaller than the sum of its proper divisors (1526264056).

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

1387512740 is a wasteful number, since it uses less digits than its factorization.

1387512740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69375646 (or 69375644 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 1387512740 is about 37249.3320745487. The cubic root of 1387512740 is about 1115.3529659339.

The spelling of 1387512740 in words is "one billion, three hundred eighty-seven million, five hundred twelve thousand, seven hundred forty".