1389978086 has 16 divisors (see below), whose sum is σ = 2421883680. Its totient is φ = 585938880.

The previous prime is 1389978077. The next prime is 1389978119. The reversal of 1389978086 is 6808799831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 812951 + ... + 814658.

It is an arithmetic number, because the mean of its divisors is an integer number (151367730).

Almost surely, 2^1389978086 is an apocalyptic number.

1389978086 is a deficient number, since it is larger than the sum of its proper divisors (1031905594).

1389978086 is a wasteful number, since it uses less digits than its factorization.

1389978086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627679.

The product of its (nonzero) digits is 5225472, while the sum is 59.

The square root of 1389978086 is about 37282.4098738266. The cubic root of 1389978086 is about 1116.0131650361.

The spelling of 1389978086 in words is "one billion, three hundred eighty-nine million, nine hundred seventy-eight thousand, eighty-six".