1389172020 has 24 divisors (see below), whose sum is σ = 3889681824. Its totient is φ = 370445856.

The previous prime is 1389172019. The next prime is 1389172063. The reversal of 1389172020 is 202719831.

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, 11576374 + ... + 11576493.

It is an arithmetic number, because the mean of its divisors is an integer number (162070076).

Almost surely, 2^1389172020 is an apocalyptic number.

1389172020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1389172020 is an abundant number, since it is smaller than the sum of its proper divisors (2500509804).

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

1389172020 is a wasteful number, since it uses less digits than its factorization.

1389172020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23152879 (or 23152877 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 1389172020 is about 37271.5980338917. The cubic root of 1389172020 is about 1115.7973932371.

The spelling of 1389172020 in words is "one billion, three hundred eighty-nine million, one hundred seventy-two thousand, twenty".