2086640 has 20 divisors (see below), whose sum is σ = 4851624. Its totient is φ = 834624.

The previous prime is 2086639. The next prime is 2086657. The reversal of 2086640 is 466802.

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12962 + ... + 13121.

2^2086640 is an apocalyptic number.

2086640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2086640 is an abundant number, since it is smaller than the sum of its proper divisors (2764984).

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

2086640 is a wasteful number, since it uses less digits than its factorization.

2086640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26096 (or 26090 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 2086640 is about 1444.5206817488. The cubic root of 2086640 is about 127.7857744768.

The spelling of 2086640 in words is "two million, eighty-six thousand, six hundred forty".