1389798605 has 16 divisors (see below), whose sum is σ = 1890577920. Its totient is φ = 972295488.

The previous prime is 1389798593. The next prime is 1389798617. The reversal of 1389798605 is 5068979831.

It is an interprime number because it is at equal distance from previous prime (1389798593) and next prime (1389798617).

It is a cyclic number.

It is not a de Polignac number, because 1389798605 - 2¹² = 1389794509 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 561437 + ... + 563906.

It is an arithmetic number, because the mean of its divisors is an integer number (118161120).

Almost surely, 2^1389798605 is an apocalyptic number.

It is an amenable number.

1389798605 is a deficient number, since it is larger than the sum of its proper divisors (500779315).

1389798605 is a wasteful number, since it uses less digits than its factorization.

1389798605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125380.

The product of its (nonzero) digits is 3265920, while the sum is 56.

The square root of 1389798605 is about 37280.0027494634. The cubic root of 1389798605 is about 1115.9651278805.

The spelling of 1389798605 in words is "one billion, three hundred eighty-nine million, seven hundred ninety-eight thousand, six hundred five".