1388923785 has 24 divisors (see below), whose sum is σ = 2408365440. Its totient is φ = 740483232.

The previous prime is 1388923751. The next prime is 1388923801. The reversal of 1388923785 is 5873298831.

It is not a de Polignac number, because 1388923785 - 2¹⁹ = 1388399497 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 188032 + ... + 195278.

It is an arithmetic number, because the mean of its divisors is an integer number (100348560).

Almost surely, 2^1388923785 is an apocalyptic number.

1388923785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1388923785 is a deficient number, since it is larger than the sum of its proper divisors (1019441655).

1388923785 is a wasteful number, since it uses less digits than its factorization.

1388923785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11517 (or 11514 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 1388923785 is about 37268.2678025153. The cubic root of 1388923785 is about 1115.7309276347.

The spelling of 1388923785 in words is "one billion, three hundred eighty-eight million, nine hundred twenty-three thousand, seven hundred eighty-five".