1328389490 has 16 divisors (see below), whose sum is σ = 2394486360. Its totient is φ = 530603520.

The previous prime is 1328389459. The next prime is 1328389499. The reversal of 1328389490 is 949838231.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1155388081 + 173001409 = 33991^2 + 13153^2 .

It is not an unprimeable number, because it can be changed into a prime (1328389499) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86591 + ... + 100770.

Almost surely, 2^1328389490 is an apocalyptic number.

1328389490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1328389490 is a deficient number, since it is larger than the sum of its proper divisors (1066096870).

1328389490 is a wasteful number, since it uses less digits than its factorization.

1328389490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188077.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 1328389490 is about 36447.0779350005. The cubic root of 1328389490 is about 1099.2803805677.

The spelling of 1328389490 in words is "one billion, three hundred twenty-eight million, three hundred eighty-nine thousand, four hundred ninety".