1388929089 has 24 divisors (see below), whose sum is σ = 1987722720. Its totient is φ = 862310592.

The previous prime is 1388929063. The next prime is 1388929117. The reversal of 1388929089 is 9809298831.

It is a de Polignac number, because none of the positive numbers 2^k-1388929089 is a prime.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (1388929039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53029 + ... + 74765.

It is an arithmetic number, because the mean of its divisors is an integer number (82821780).

Almost surely, 2^1388929089 is an apocalyptic number.

1388929089 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1388929089 is a deficient number, since it is larger than the sum of its proper divisors (598793631).

1388929089 is a wasteful number, since it uses less digits than its factorization.

1388929089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21837 (or 21818 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 57.

The square root of 1388929089 is about 37268.3389621808. The cubic root of 1388929089 is about 1115.7323478780.

The spelling of 1388929089 in words is "one billion, three hundred eighty-eight million, nine hundred twenty-nine thousand, eighty-nine".