1438895664 has 150 divisors (see below), whose sum is σ = 4285457484. Its totient is φ = 466093440.

The previous prime is 1438895621. The next prime is 1438895677. The reversal of 1438895664 is 4665988341.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 1438895664.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1773819 + ... + 1774629.

Almost surely, 2^1438895664 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 1438895664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2142728742).

1438895664 is an abundant number, since it is smaller than the sum of its proper divisors (2846561820).

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

1438895664 is an equidigital number, since it uses as much as digits as its factorization.

1438895664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905 (or 853 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The square root of 1438895664 is about 37932.7782267527. The cubic root of 1438895664 is about 1128.9544886193.

The spelling of 1438895664 in words is "one billion, four hundred thirty-eight million, eight hundred ninety-five thousand, six hundred sixty-four".