1388781087 has 16 divisors (see below), whose sum is σ = 1942548480. Its totient is φ = 881333600.

The previous prime is 1388781073. The next prime is 1388781091. The reversal of 1388781087 is 7801878831.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1388781087 - 2⁴ = 1388781071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388781067) 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 15 ways as a sum of consecutive naturals, for example, 106239 + ... + 118592.

It is an arithmetic number, because the mean of its divisors is an integer number (121409280).

Almost surely, 2^1388781087 is an apocalyptic number.

1388781087 is a deficient number, since it is larger than the sum of its proper divisors (553767393).

1388781087 is a wasteful number, since it uses less digits than its factorization.

1388781087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224934.

The product of its (nonzero) digits is 602112, while the sum is 51.

The square root of 1388781087 is about 37266.3532828207. The cubic root of 1388781087 is about 1115.6927162688.

The spelling of 1388781087 in words is "one billion, three hundred eighty-eight million, seven hundred eighty-one thousand, eighty-seven".