1389648518 has 4 divisors (see below), whose sum is σ = 2084472780. Its totient is φ = 694824258.

The previous prime is 1389648511. The next prime is 1389648539. The reversal of 1389648518 is 8158469831.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×1389648518² = 3862246007159192648, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1389648518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389648511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347412128 + ... + 347412131.

It is an arithmetic number, because the mean of its divisors is an integer number (521118195).

Almost surely, 2^1389648518 is an apocalyptic number.

1389648518 is a deficient number, since it is larger than the sum of its proper divisors (694824262).

1389648518 is an equidigital number, since it uses as much as digits as its factorization.

1389648518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694824261.

The product of its digits is 1658880, while the sum is 53.

The square root of 1389648518 is about 37277.9897258422. The cubic root of 1389648518 is about 1115.9249547007.

The spelling of 1389648518 in words is "one billion, three hundred eighty-nine million, six hundred forty-eight thousand, five hundred eighteen".