1438722720 has 144 divisors (see below), whose sum is σ = 4972181760. Its totient is φ = 378772992.

The previous prime is 1438722709. The next prime is 1438722737. The reversal of 1438722720 is 272278341.

1438722720 is a `hidden beast` number, since 1 + 4 + 387 + 2 + 272 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 107437 + ... + 120083.

It is an arithmetic number, because the mean of its divisors is an integer number (34529040).

Almost surely, 2^1438722720 is an apocalyptic number.

1438722720 is a gapful number since it is divisible by the number (10) 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 1438722720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2486090880).

1438722720 is an abundant number, since it is smaller than the sum of its proper divisors (3533459040).

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

1438722720 is a wasteful number, since it uses less digits than its factorization.

1438722720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12747 (or 12736 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 1438722720 is about 37930.4985466840. The cubic root of 1438722720 is about 1128.9092563084.

The spelling of 1438722720 in words is "one billion, four hundred thirty-eight million, seven hundred twenty-two thousand, seven hundred twenty".