1389658207 has 4 divisors (see below), whose sum is σ = 1588180816. Its totient is φ = 1191135600.

The previous prime is 1389658187. The next prime is 1389658213. The reversal of 1389658207 is 7028569831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7028569831 = 9859 ⋅712909.

It is a cyclic number.

It is not a de Polignac number, because 1389658207 - 2²³ = 1381269599 is a prime.

It is a super-2 number, since 2×1389658207² = 3862299864564909698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389658007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99261294 + ... + 99261307.

It is an arithmetic number, because the mean of its divisors is an integer number (397045204).

Almost surely, 2^1389658207 is an apocalyptic number.

1389658207 is a deficient number, since it is larger than the sum of its proper divisors (198522609).

1389658207 is an equidigital number, since it uses as much as digits as its factorization.

1389658207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198522608.

The product of its (nonzero) digits is 725760, while the sum is 49.

The square root of 1389658207 is about 37278.1196816578. The cubic root of 1389658207 is about 1115.9275482035.

The spelling of 1389658207 in words is "one billion, three hundred eighty-nine million, six hundred fifty-eight thousand, two hundred seven".