1386390528 has 132 divisors (see below), whose sum is σ = 4239132300. Its totient is φ = 434896896.

The previous prime is 1386390491. The next prime is 1386390529. The reversal of 1386390528 is 8250936831.

It is a happy number.

1386390528 is a `hidden beast` number, since 1 + 3 + 8 + 639 + 0 + 5 + 2 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 394896384 + 991494144 = 19872^2 + 31488^2 .

It is a super-2 number, since 2×1386390528² = 3844157392256237568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1386390529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 152248 + ... + 161096.

Almost surely, 2^1386390528 is an apocalyptic number.

1386390528 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1386390528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2119566150).

1386390528 is an abundant number, since it is smaller than the sum of its proper divisors (2852741772).

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

1386390528 is a wasteful number, since it uses less digits than its factorization.

1386390528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8892 (or 8871 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 1386390528 is about 37234.2655090711. The cubic root of 1386390528 is about 1115.0521878956.

The spelling of 1386390528 in words is "one billion, three hundred eighty-six million, three hundred ninety thousand, five hundred twenty-eight".