8149840 has 20 divisors (see below), whose sum is σ = 18948564. Its totient is φ = 3259904.

The previous prime is 8149831. The next prime is 8149849. The reversal of 8149840 is 489418.

It is an interprime number because it is at equal distance from previous prime (8149831) and next prime (8149849).

It can be written as a sum of positive squares in 2 ways, for example, as 2274064 + 5875776 = 1508^2 + 2424^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 8149796 and 8149805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8149849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50857 + ... + 51016.

Almost surely, 2^8149840 is an apocalyptic number.

8149840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8149840 is an abundant number, since it is smaller than the sum of its proper divisors (10798724).

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

8149840 is a wasteful number, since it uses less digits than its factorization.

8149840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101886 (or 101880 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 8149840 is about 2854.7924618087. The cubic root of 8149840 is about 201.2409509453.

The spelling of 8149840 in words is "eight million, one hundred forty-nine thousand, eight hundred forty".