140019889 has 3 divisors (see below), whose sum is σ = 140031723. Its totient is φ = 140008056.

The previous prime is 140019857. The next prime is 140019907. The reversal of 140019889 is 988910041.

The square root of 140019889 is 11833.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 132135025 + 7884864 = 11495^2 + 2808^2 .

It is not a de Polignac number, because 140019889 - 2⁵ = 140019857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140019829) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5917 + ... + 17749.

It is an arithmetic number, because the mean of its divisors is an integer number (46677241).

Almost surely, 2^140019889 is an apocalyptic number.

140019889 is the 11833-rd square number.

140019889 is the 5917-th centered octagonal number.

It is an amenable number.

140019889 is a deficient number, since it is larger than the sum of its proper divisors (11834).

140019889 is an frugal number, since it uses more digits than its factorization.

140019889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23666 (or 11833 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 40.

The cubic root of 140019889 is about 519.2739979530.

Multiplying 140019889 by its product of nonzero digits (20736), we get a square (2903452418304 = 1703952²).

The spelling of 140019889 in words is "one hundred forty million, nineteen thousand, eight hundred eighty-nine".