1389944087 has 8 divisors (see below), whose sum is σ = 1589285376. Its totient is φ = 1190797272.

The previous prime is 1389944081. The next prime is 1389944099. The reversal of 1389944087 is 7804499831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1389944087 - 2²⁴ = 1373166871 is a prime.

It is a super-3 number, since 3×1389944087³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389944081) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 32963 + ... + 62180.

It is an arithmetic number, because the mean of its divisors is an integer number (198660672).

Almost surely, 2^1389944087 is an apocalyptic number.

1389944087 is a deficient number, since it is larger than the sum of its proper divisors (199341289).

1389944087 is an equidigital number, since it uses as much as digits as its factorization.

1389944087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97237.

The product of its (nonzero) digits is 1741824, while the sum is 53.

The square root of 1389944087 is about 37281.9539053414. The cubic root of 1389944087 is about 1116.0040656982.

The spelling of 1389944087 in words is "one billion, three hundred eighty-nine million, nine hundred forty-four thousand, eighty-seven".