1389077872 has 120 divisors (see below), whose sum is σ = 3419583216. Its totient is φ = 541707264.

The previous prime is 1389077863. The next prime is 1389077881. The reversal of 1389077872 is 2787709831.

It is an interprime number because it is at equal distance from previous prime (1389077863) and next prime (1389077881).

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 743083 + ... + 744949.

Almost surely, 2^1389077872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1389077872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1709791608).

1389077872 is an abundant number, since it is smaller than the sum of its proper divisors (2030505344).

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

1389077872 is a wasteful number, since it uses less digits than its factorization.

1389077872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1975 (or 1962 counting only the distinct ones).

The product of its (nonzero) digits is 1185408, while the sum is 52.

The square root of 1389077872 is about 37270.3350132515. The cubic root of 1389077872 is about 1115.7721857839.

The spelling of 1389077872 in words is "one billion, three hundred eighty-nine million, seventy-seven thousand, eight hundred seventy-two".