1389981590 has 64 divisors (see below), whose sum is σ = 2678598720. Its totient is φ = 518492160.

The previous prime is 1389981577. The next prime is 1389981623. The reversal of 1389981590 is 951899831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 894254 + ... + 895806.

It is an arithmetic number, because the mean of its divisors is an integer number (41853105).

Almost surely, 2^1389981590 is an apocalyptic number.

1389981590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1389981590 is a deficient number, since it is larger than the sum of its proper divisors (1288617130).

1389981590 is a wasteful number, since it uses less digits than its factorization.

1389981590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1697.

The product of its (nonzero) digits is 699840, while the sum is 53.

The square root of 1389981590 is about 37282.4568664674. The cubic root of 1389981590 is about 1116.0141028223.

The spelling of 1389981590 in words is "one billion, three hundred eighty-nine million, nine hundred eighty-one thousand, five hundred ninety".