1389240689 has 16 divisors (see below), whose sum is σ = 1505169600. Its totient is φ = 1277954496.

The previous prime is 1389240661. The next prime is 1389240709. The reversal of 1389240689 is 9860429831.

It is a happy number.

It is not a de Polignac number, because 1389240689 - 2¹⁶ = 1389175153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1389242689) 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, 136427 + ... + 146255.

It is an arithmetic number, because the mean of its divisors is an integer number (94073100).

Almost surely, 2^1389240689 is an apocalyptic number.

1389240689 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1389240689 is a deficient number, since it is larger than the sum of its proper divisors (115928911).

1389240689 is a wasteful number, since it uses less digits than its factorization.

1389240689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10064.

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 1389240689 is about 37272.5192199293. The cubic root of 1389240689 is about 1115.8157781522.

The spelling of 1389240689 in words is "one billion, three hundred eighty-nine million, two hundred forty thousand, six hundred eighty-nine".