1389432825 has 48 divisors (see below), whose sum is σ = 2784494400. Its totient is φ = 673660800.

The previous prime is 1389432799. The next prime is 1389432851. The reversal of 1389432825 is 5282349831.

1389432825 is a `hidden beast` number, since 138 + 9 + 432 + 82 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (1389432799) and next prime (1389432851).

It is not a de Polignac number, because 1389432825 - 2²⁵ = 1355878393 is a prime.

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

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 47 ways as a sum of consecutive naturals, for example, 86140 + ... + 100989.

It is an arithmetic number, because the mean of its divisors is an integer number (58010300).

Almost surely, 2^1389432825 is an apocalyptic number.

1389432825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1389432825 is an abundant number, since it is smaller than the sum of its proper divisors (1395061575).

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

1389432825 is a wasteful number, since it uses less digits than its factorization.

1389432825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187159 (or 187148 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 1389432825 is about 37275.0965793517. The cubic root of 1389432825 is about 1115.8672159626.

The spelling of 1389432825 in words is "one billion, three hundred eighty-nine million, four hundred thirty-two thousand, eight hundred twenty-five".