1389016665 has 48 divisors (see below), whose sum is σ = 2481912576. Its totient is φ = 718300800.

The previous prime is 1389016663. The next prime is 1389016691. The reversal of 1389016665 is 5666109831.

It is not a de Polignac number, because 1389016665 - 2¹ = 1389016663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1389016665.

It is not an unprimeable number, because it can be changed into a prime (1389016661) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 191332 + ... + 198458.

It is an arithmetic number, because the mean of its divisors is an integer number (51706512).

Almost surely, 2^1389016665 is an apocalyptic number.

1389016665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1389016665 is a deficient number, since it is larger than the sum of its proper divisors (1092895911).

1389016665 is a wasteful number, since it uses less digits than its factorization.

1389016665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7270 (or 7267 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 1389016665 is about 37269.5138819921. The cubic root of 1389016665 is about 1115.7557974367.

The spelling of 1389016665 in words is "one billion, three hundred eighty-nine million, sixteen thousand, six hundred sixty-five".