289193840 has 40 divisors (see below), whose sum is σ = 724099488. Its totient is φ = 106778880.

The previous prime is 289193831. The next prime is 289193899. The reversal of 289193840 is 48391982.

It is a happy number.

289193840 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 289193791 and 289193800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137996 + ... + 140075.

Almost surely, 2^289193840 is an apocalyptic number.

289193840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

289193840 is an abundant number, since it is smaller than the sum of its proper divisors (434905648).

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

289193840 is a wasteful number, since it uses less digits than its factorization.

289193840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278097 (or 278091 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 289193840 is about 17005.7002208083. The cubic root of 289193840 is about 661.2966855378.

The spelling of 289193840 in words is "two hundred eighty-nine million, one hundred ninety-three thousand, eight hundred forty".