206907840 has 84 divisors (see below), whose sum is σ = 711686664. Its totient is φ = 55174656.

The previous prime is 206907821. The next prime is 206907847. The reversal of 206907840 is 48709602.

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 = 206907795 and 206907804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206907847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33042 + ... + 38801.

Almost surely, 2^206907840 is an apocalyptic number.

206907840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206907840 is an abundant number, since it is smaller than the sum of its proper divisors (504778824).

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

206907840 is a wasteful number, since it uses less digits than its factorization.

206907840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71866 (or 71853 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 206907840 is about 14384.2914319754. The cubic root of 206907840 is about 591.4603677607.

The spelling of 206907840 in words is "two hundred six million, nine hundred seven thousand, eight hundred forty".