1387801928 has 12 divisors (see below), whose sum is σ = 2602326195. Its totient is φ = 693848280.

The previous prime is 1387801903. The next prime is 1387801937. The reversal of 1387801928 is 8291087831.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 693900964 + 693900964 = 26342^2 + 26342^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=26342.

It is a Duffinian 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 2 ways as a sum of consecutive naturals, for example, 98783 + ... + 111953.

Almost surely, 2^1387801928 is an apocalyptic number.

It is an amenable number.

1387801928 is a deficient number, since it is larger than the sum of its proper divisors (1214524267).

1387801928 is an frugal number, since it uses more digits than its factorization.

1387801928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26348 (or 13173 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 1387801928 is about 37253.2136600321. The cubic root of 1387801928 is about 1115.4304485347.

The spelling of 1387801928 in words is "one billion, three hundred eighty-seven million, eight hundred one thousand, nine hundred twenty-eight".