1389333690 has 36 divisors (see below), whose sum is σ = 3613187214. Its totient is φ = 370394688.

The previous prime is 1389333661. The next prime is 1389333703. The reversal of 1389333690 is 963339831.

1389333690 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 587141361 + 802192329 = 24231^2 + 28323^2 .

It is a super-2 number, since 2×1389333690² = 3860496204338032200, which contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 351646 + ... + 355574.

Almost surely, 2^1389333690 is an apocalyptic number.

1389333690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1389333690 is an abundant number, since it is smaller than the sum of its proper divisors (2223853524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1389333690 is an frugal number, since it uses more digits than its factorization.

1389333690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7871 (or 3939 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 45.

The square root of 1389333690 is about 37273.7667804047. The cubic root of 1389333690 is about 1115.8406765657.

The spelling of 1389333690 in words is "one billion, three hundred eighty-nine million, three hundred thirty-three thousand, six hundred ninety".