1389772500 has 60 divisors (see below), whose sum is σ = 4052227872. Its totient is φ = 370604000.

The previous prime is 1389772477. The next prime is 1389772541. The reversal of 1389772500 is 52779831.

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 85152 + ... + 100151.

Almost surely, 2^1389772500 is an apocalyptic number.

1389772500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1389772500 is an abundant number, since it is smaller than the sum of its proper divisors (2662455372).

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

1389772500 is a wasteful number, since it uses less digits than its factorization.

1389772500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185330 (or 185313 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 42.

The square root of 1389772500 is about 37279.6526271370. The cubic root of 1389772500 is about 1115.9581406686.

The spelling of 1389772500 in words is "one billion, three hundred eighty-nine million, seven hundred seventy-two thousand, five hundred".