1389890070 has 128 divisors (see below), whose sum is σ = 3790126080. Its totient is φ = 362361600.

The previous prime is 1389890059. The next prime is 1389890077. The reversal of 1389890070 is 700989831.

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

It is a junction number, because it is equal to n+sod(n) for n = 1389889998 and 1389890025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389890077) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2975977 + ... + 2976443.

It is an arithmetic number, because the mean of its divisors is an integer number (29610360).

Almost surely, 2^1389890070 is an apocalyptic number.

1389890070 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1389890070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1895063040).

1389890070 is an abundant number, since it is smaller than the sum of its proper divisors (2400236010).

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

1389890070 is a wasteful number, since it uses less digits than its factorization.

1389890070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707 (or 701 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 1389890070 is about 37281.2294593405. The cubic root of 1389890070 is about 1115.9896085285.

The spelling of 1389890070 in words is "one billion, three hundred eighty-nine million, eight hundred ninety thousand, seventy".