1389432456 has 96 divisors (see below), whose sum is σ = 4097808000. Its totient is φ = 423626112.

The previous prime is 1389432449. The next prime is 1389432467. The reversal of 1389432456 is 6542349831.

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, 22161 + ... + 57183.

It is an arithmetic number, because the mean of its divisors is an integer number (42685500).

Almost surely, 2^1389432456 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 1389432456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2048904000).

1389432456 is an abundant number, since it is smaller than the sum of its proper divisors (2708375544).

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

1389432456 is a wasteful number, since it uses less digits than its factorization.

1389432456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35083 (or 35076 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 1389432456 is about 37275.0916296660. The cubic root of 1389432456 is about 1115.8671171801.

The spelling of 1389432456 in words is "one billion, three hundred eighty-nine million, four hundred thirty-two thousand, four hundred fifty-six".