1387280540 has 24 divisors (see below), whose sum is σ = 3013748640. Its totient is φ = 535777088.

The previous prime is 1387280533. The next prime is 1387280567. The reversal of 1387280540 is 450827831.

It is a junction number, because it is equal to n+sod(n) for n = 1387280494 and 1387280503.

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 7 ways as a sum of consecutive naturals, for example, 1195352 + ... + 1196511.

It is an arithmetic number, because the mean of its divisors is an integer number (125572860).

Almost surely, 2^1387280540 is an apocalyptic number.

1387280540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1387280540 is an abundant number, since it is smaller than the sum of its proper divisors (1626468100).

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

1387280540 is a wasteful number, since it uses less digits than its factorization.

1387280540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2391901 (or 2391899 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 1387280540 is about 37246.2151097262. The cubic root of 1387280540 is about 1115.2907444254.

The spelling of 1387280540 in words is "one billion, three hundred eighty-seven million, two hundred eighty thousand, five hundred forty".