289404540 has 72 divisors (see below), whose sum is σ = 879260928. Its totient is φ = 77051520.

The previous prime is 289404509. The next prime is 289404569. The reversal of 289404540 is 45404982.

289404540 is a `hidden beast` number, since 28 + 94 + 0 + 4 + 540 = 666.

It is a super-2 number, since 2×289404540² = 167509975545223200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a junction number, because it is equal to n+sod(n) for n = 289404495 and 289404504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 196005 + ... + 197475.

Almost surely, 2^289404540 is an apocalyptic number.

289404540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

289404540 is an abundant number, since it is smaller than the sum of its proper divisors (589856388).

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

289404540 is a wasteful number, since it uses less digits than its factorization.

289404540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2579 (or 2574 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 289404540 is about 17011.8940744410. The cubic root of 289404540 is about 661.4572484167.

The spelling of 289404540 in words is "two hundred eighty-nine million, four hundred four thousand, five hundred forty".