1390128789 has 16 divisors (see below), whose sum is σ = 2118860928. Its totient is φ = 794145792.

The previous prime is 1390128781. The next prime is 1390128791. The reversal of 1390128789 is 9878210931.

It is not a de Polignac number, because 1390128789 - 2³ = 1390128781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390128781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104989 + ... + 117485.

It is an arithmetic number, because the mean of its divisors is an integer number (132428808).

Almost surely, 2^1390128789 is an apocalyptic number.

It is an amenable number.

1390128789 is a deficient number, since it is larger than the sum of its proper divisors (728732139).

1390128789 is a wasteful number, since it uses less digits than its factorization.

1390128789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17804.

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 1390128789 is about 37284.4309196211. The cubic root of 1390128789 is about 1116.0534967161.

The spelling of 1390128789 in words is "one billion, three hundred ninety million, one hundred twenty-eight thousand, seven hundred eighty-nine".