1442721889 has 16 divisors (see below), whose sum is σ = 1737450880. Its totient is φ = 1170288000.

The previous prime is 1442721877. The next prime is 1442721901. The reversal of 1442721889 is 9881272441.

It is an interprime number because it is at equal distance from previous prime (1442721877) and next prime (1442721901).

It is not a de Polignac number, because 1442721889 - 2⁵ = 1442721857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1442721809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132139 + ... + 142639.

It is an arithmetic number, because the mean of its divisors is an integer number (108590680).

Almost surely, 2^1442721889 is an apocalyptic number.

1442721889 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1442721889 is a deficient number, since it is larger than the sum of its proper divisors (294728991).

1442721889 is a wasteful number, since it uses less digits than its factorization.

1442721889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11560.

The product of its digits is 258048, while the sum is 46.

The square root of 1442721889 is about 37983.1790270377. The cubic root of 1442721889 is about 1129.9542856177.

The spelling of 1442721889 in words is "one billion, four hundred forty-two million, seven hundred twenty-one thousand, eight hundred eighty-nine".