289656340 has 24 divisors (see below), whose sum is σ = 609154560. Its totient is φ = 115695648.

The previous prime is 289656337. The next prime is 289656371. The reversal of 289656340 is 43656982.

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, 4309 + ... + 24451.

It is an arithmetic number, because the mean of its divisors is an integer number (25381440).

Almost surely, 2^289656340 is an apocalyptic number.

289656340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

289656340 is an abundant number, since it is smaller than the sum of its proper divisors (319498220).

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

289656340 is a wasteful number, since it uses less digits than its factorization.

289656340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20871 (or 20869 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 289656340 is about 17019.2931698117. The cubic root of 289656340 is about 661.6490291608.

The spelling of 289656340 in words is "two hundred eighty-nine million, six hundred fifty-six thousand, three hundred forty".