1639394368 has 28 divisors (see below), whose sum is σ = 3394618560. Its totient is φ = 784057472.

The previous prime is 1639394363. The next prime is 1639394369. The reversal of 1639394368 is 8634939361.

It is a super-2 number, since 2×1639394368² = 5375227787660238848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1639394363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 555388 + ... + 558331.

Almost surely, 2^1639394368 is an apocalyptic number.

It is an amenable number.

1639394368 is an abundant number, since it is smaller than the sum of its proper divisors (1755224192).

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

1639394368 is a wasteful number, since it uses less digits than its factorization.

1639394368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113754 (or 1113744 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 52.

The square root of 1639394368 is about 40489.4352640291. The cubic root of 1639394368 is about 1179.1285263217.

The spelling of 1639394368 in words is "one billion, six hundred thirty-nine million, three hundred ninety-four thousand, three hundred sixty-eight".