8145840 has 40 divisors (see below), whose sum is σ = 25252848. Its totient is φ = 2172160.

The previous prime is 8145833. The next prime is 8145853. The reversal of 8145840 is 485418.

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

It is a hoax number, since the sum of its digits (30) 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 (30).

It is a junction number, because it is equal to n+sod(n) for n = 8145798 and 8145807.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16731 + ... + 17210.

Almost surely, 2^8145840 is an apocalyptic number.

8145840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8145840 is an abundant number, since it is smaller than the sum of its proper divisors (17107008).

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

8145840 is a wasteful number, since it uses less digits than its factorization.

8145840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33957 (or 33951 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 8145840 is about 2854.0917995047. The cubic root of 8145840 is about 201.2080220562.

The spelling of 8145840 in words is "eight million, one hundred forty-five thousand, eight hundred forty".