859440 has 40 divisors (see below), whose sum is σ = 2665008. Its totient is φ = 229120.

The previous prime is 859433. The next prime is 859447. The reversal of 859440 is 44958.

It is an interprime number because it is at equal distance from previous prime (859433) and next prime (859447).

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

It is a super-2 number, since 2×859440² = 1477274227200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 859398 and 859407.

It is not an unprimeable number, because it can be changed into a prime (859447) by changing a digit.

859440 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1551 + ... + 2030.

2⁸⁵⁹⁴⁴⁰ is an apocalyptic number.

859440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

859440 is an abundant number, since it is smaller than the sum of its proper divisors (1805568).

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

859440 is a wasteful number, since it uses less digits than its factorization.

859440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3597 (or 3591 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 859440 is about 927.0598686169. The cubic root of 859440 is about 95.0762084711.

The spelling of 859440 in words is "eight hundred fifty-nine thousand, four hundred forty".