1438186664 has 8 divisors (see below), whose sum is σ = 2696600010. Its totient is φ = 719093328.

The previous prime is 1438186663. The next prime is 1438186697. The reversal of 1438186664 is 4666818341.

It can be written as a sum of positive squares in only one way, i.e., 1199236900 + 238949764 = 34630^2 + 15458^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1438186661) by changing a digit.

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 as a sum of consecutive naturals, namely, 89886659 + ... + 89886674.

Almost surely, 2^1438186664 is an apocalyptic number.

It is an amenable number.

1438186664 is a deficient number, since it is larger than the sum of its proper divisors (1258413346).

1438186664 is a wasteful number, since it uses less digits than its factorization.

1438186664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179773339 (or 179773335 counting only the distinct ones).

The product of its digits is 663552, while the sum is 47.

The square root of 1438186664 is about 37923.4315957826. The cubic root of 1438186664 is about 1128.7690315228.

The spelling of 1438186664 in words is "one billion, four hundred thirty-eight million, one hundred eighty-six thousand, six hundred sixty-four".